diff --git a/GreenshotCore/Helpers/CredentialsHelper.cs b/GreenshotCore/Helpers/CredentialsHelper.cs
new file mode 100644
index 000000000..256fd1cc3
--- /dev/null
+++ b/GreenshotCore/Helpers/CredentialsHelper.cs
@@ -0,0 +1,593 @@
+/*
+ * Greenshot - a free and open source screenshot tool
+ * Copyright (C) 2007-2010  Thomas Braun, Jens Klingen, Robin Krom
+ * 
+ * For more information see: http://getgreenshot.org/
+ * The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 1 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+using System;
+using System.Drawing;
+using System.Runtime.InteropServices;
+using System.Reflection;
+using System.Text;
+using System.Threading;
+using System.Windows.Forms;
+
+/// <summary>
+/// The following code comes from: http://www.developerfusion.com/code/4693/using-the-credential-management-api/
+/// and is slightly modified so it works for us.
+/// The following code is an example for a login, it will call the Authenticate with user/password
+/// which should return true if the login worked, false if not.
+///		private static bool Login(string system, string name) {
+///			try {
+///				CredentialsDialog dialog = new CredentialsDialog(system);
+///				dialog.Name = name;
+///				while (dialog.Show(dialog.Name) == DialogResult.OK) {
+///					if (Authenticate(dialog.Name, dialog.Password)) {
+///						if (dialog.SaveChecked) dialog.Confirm(true);
+///						return true;
+///					} else {
+///						try {
+///							dialog.Confirm(false);
+///						} catch (ApplicationException) {
+///							// exception handling ...
+///						}
+///					}
+///				}
+///			} catch (ApplicationException) {
+///				// exception handling ...
+///			}
+///			return false;
+///		}
+/// </summary>
+namespace Greenshot.Helpers {
+	/// <summary>Encapsulates dialog functionality from the Credential Management API.</summary>
+	public sealed class CredentialsDialog {
+		/// <summary>The only valid bitmap height (in pixels) of a user-defined banner.</summary>
+		private const int ValidBannerHeight = 60;
+
+		/// <summary>The only valid bitmap width (in pixels) of a user-defined banner.</summary>
+		private const int ValidBannerWidth = 320;
+
+		/// <summary>Initializes a new instance of the <see cref="T:SecureCredentialsLibrary.CredentialsDialog"/> class
+		/// with the specified target.</summary>
+		/// <param name="target">The name of the target for the credentials, typically a server name.</param>
+		public CredentialsDialog(string target) : this(target, null) {
+		}
+
+		/// <summary>Initializes a new instance of the <see cref="T:SecureCredentialsLibrary.CredentialsDialog"/> class
+		/// with the specified target and caption.</summary>
+		/// <param name="target">The name of the target for the credentials, typically a server name.</param>
+		/// <param name="caption">The caption of the dialog (null will cause a system default title to be used).</param>
+		public CredentialsDialog(string target, string caption) : this(target, caption, null) {
+		}
+
+		/// <summary>Initializes a new instance of the <see cref="T:SecureCredentialsLibrary.CredentialsDialog"/> class
+		/// with the specified target, caption and message.</summary>
+		/// <param name="target">The name of the target for the credentials, typically a server name.</param>
+		/// <param name="caption">The caption of the dialog (null will cause a system default title to be used).</param>
+		/// <param name="message">The message of the dialog (null will cause a system default message to be used).</param>
+		public CredentialsDialog(string target, string caption, string message) : this(target, caption, message, null) {
+		}
+
+		/// <summary>Initializes a new instance of the <see cref="T:SecureCredentialsLibrary.CredentialsDialog"/> class
+		/// with the specified target, caption, message and banner.</summary>
+		/// <param name="target">The name of the target for the credentials, typically a server name.</param>
+		/// <param name="caption">The caption of the dialog (null will cause a system default title to be used).</param>
+		/// <param name="message">The message of the dialog (null will cause a system default message to be used).</param>
+		/// <param name="banner">The image to display on the dialog (null will cause a system default image to be used).</param>
+		public CredentialsDialog(string target, string caption, string message, Image banner) {
+			this.Target = target;
+			this.Caption = caption;
+			this.Message = message;
+			this.Banner = banner;
+		}
+
+		private bool _alwaysDisplay = false;
+		/// <summary>
+		/// Gets or sets if the dialog will be shown even if the credentials
+		/// can be returned from an existing credential in the credential manager.
+		/// </summary>
+		public bool AlwaysDisplay {
+			get {
+				return _alwaysDisplay;
+			}
+			set {
+				_alwaysDisplay = value;
+			}
+		}
+
+		private bool _excludeCertificates = true;
+		/// <summary>Gets or sets if the dialog is populated with name/password only.</summary>
+		public bool ExcludeCertificates {
+			get {
+				return _excludeCertificates;
+			}
+			set {
+				_excludeCertificates = value;
+			}
+		}
+
+		private bool _persist = true;
+		/// <summary>Gets or sets if the credentials are to be persisted in the credential manager.</summary>
+		public bool Persist {
+			get {
+				return _persist;
+			}
+			set {
+				_persist = value;
+			}
+		}
+
+		private bool _keepName = false;
+		/// <summary>Gets or sets if the name is read-only.</summary>
+		public bool KeepName {
+			get {
+				return _keepName;
+			}
+			set {
+				_keepName = value;
+			}
+		}
+
+		private string _name = String.Empty;
+		/// <summary>Gets or sets the name for the credentials.</summary>
+		public string Name {
+			get {
+				return _name;
+			}
+			set {
+				if (value != null) {
+					if (value.Length > CREDUI.MAX_USERNAME_LENGTH) {
+						string message = String.Format(
+							Thread.CurrentThread.CurrentUICulture,
+							"The name has a maximum length of {0} characters.",
+							CREDUI.MAX_USERNAME_LENGTH);
+						throw new ArgumentException(message, "Name");
+					}
+				}
+				_name = value;
+			}
+		}
+
+		private string _password = String.Empty;
+		/// <summary>Gets or sets the password for the credentials.</summary>
+		public string Password {
+			get {
+				return _password;
+			}
+			set {
+				if (value != null) {
+					if (value.Length > CREDUI.MAX_PASSWORD_LENGTH) {
+						string message = String.Format(
+							Thread.CurrentThread.CurrentUICulture,
+							"The password has a maximum length of {0} characters.",
+							CREDUI.MAX_PASSWORD_LENGTH);
+						throw new ArgumentException(message, "Password");
+					}
+				}
+				_password = value;
+			}
+		}
+
+		private bool _saveChecked = false;
+		/// <summary>Gets or sets if the save checkbox status.</summary>
+		public bool SaveChecked {
+			get {
+				return _saveChecked;
+			}
+			set {
+				_saveChecked = value;
+			}
+		}
+
+		private bool _saveDisplayed = true;
+		/// <summary>Gets or sets if the save checkbox is displayed.</summary>
+		/// <remarks>This value only has effect if Persist is true.</remarks>
+		public bool SaveDisplayed {
+			get {
+				return _saveDisplayed;
+			}
+			set {
+				_saveDisplayed = value;
+			}
+		}
+
+		private string _target = String.Empty;
+		/// <summary>Gets or sets the name of the target for the credentials, typically a server name.</summary>
+		public string Target {
+			get {
+				return _target;
+			}
+			set {
+				if (value == null) {
+					throw new ArgumentException("The target cannot be a null value.", "Target");
+				} else if (value.Length > CREDUI.MAX_GENERIC_TARGET_LENGTH) {
+					string message = String.Format(
+						Thread.CurrentThread.CurrentUICulture,
+						"The target has a maximum length of {0} characters.",
+						CREDUI.MAX_GENERIC_TARGET_LENGTH);
+					throw new ArgumentException(message, "Target");
+				}
+				_target = value;
+			}
+		}
+
+		private string _caption = String.Empty;
+		/// <summary>Gets or sets the caption of the dialog.</summary>
+		/// <remarks>A null value will cause a system default caption to be used.</remarks>
+		public string Caption {
+			get {
+				return _caption;
+			}
+			set {
+				if (value != null) {
+					if (value.Length > CREDUI.MAX_CAPTION_LENGTH) {
+						string message = String.Format(
+							Thread.CurrentThread.CurrentUICulture,
+							"The caption has a maximum length of {0} characters.",
+							CREDUI.MAX_CAPTION_LENGTH);
+						throw new ArgumentException(message, "Caption");
+					}
+				}
+				_caption = value;
+			}
+		}
+
+		private string _message = String.Empty;
+		/// <summary>Gets or sets the message of the dialog.</summary>
+		/// <remarks>A null value will cause a system default message to be used.</remarks>
+		public string Message {
+			get {
+				return _message;
+			}
+			set {
+				if (value != null) {
+					if (value.Length > CREDUI.MAX_MESSAGE_LENGTH) {
+						string message = String.Format(
+							Thread.CurrentThread.CurrentUICulture,
+							"The message has a maximum length of {0} characters.",
+							CREDUI.MAX_MESSAGE_LENGTH);
+						throw new ArgumentException(message, "Message");
+					}
+				}
+				_message = value;
+			}
+		}
+
+		private Image _banner = null;
+		/// <summary>Gets or sets the image to display on the dialog.</summary>
+		/// <remarks>A null value will cause a system default image to be used.</remarks>
+		public Image Banner {
+			get {
+				return _banner;
+			}
+			set {
+				if (value != null) {
+					if (value.Width != ValidBannerWidth) {
+						throw new ArgumentException("The banner image width must be 320 pixels.", "Banner");
+					}
+					if (value.Height != ValidBannerHeight) {
+						throw new ArgumentException("The banner image height must be 60 pixels.", "Banner");
+					}
+				}
+				_banner = value;
+			}
+		}
+
+		/// <summary>Shows the credentials dialog.</summary>
+		/// <returns>Returns a DialogResult indicating the user action.</returns>
+		public DialogResult Show() {
+			return Show(null, this.Name, this.Password, this.SaveChecked);
+		}
+
+		/// <summary>Shows the credentials dialog with the specified save checkbox status.</summary>
+		/// <param name="saveChecked">True if the save checkbox is checked.</param>
+		/// <returns>Returns a DialogResult indicating the user action.</returns>
+		public DialogResult Show(bool saveChecked) {
+			return Show(null, this.Name, this.Password, saveChecked);
+		}
+
+		/// <summary>Shows the credentials dialog with the specified name.</summary>
+		/// <param name="name">The name for the credentials.</param>
+		/// <returns>Returns a DialogResult indicating the user action.</returns>
+		public DialogResult Show(string name) {
+			return Show(null, name, this.Password, this.SaveChecked);
+		}
+
+		/// <summary>Shows the credentials dialog with the specified name and password.</summary>
+		/// <param name="name">The name for the credentials.</param>
+		/// <param name="password">The password for the credentials.</param>
+		/// <returns>Returns a DialogResult indicating the user action.</returns>
+		public DialogResult Show(string name, string password) {
+			return Show(null, name, password, this.SaveChecked);
+		}
+
+		/// <summary>Shows the credentials dialog with the specified name, password and save checkbox status.</summary>
+		/// <param name="name">The name for the credentials.</param>
+		/// <param name="password">The password for the credentials.</param>
+		/// <param name="saveChecked">True if the save checkbox is checked.</param>
+		/// <returns>Returns a DialogResult indicating the user action.</returns>
+		public DialogResult Show(string name, string password, bool saveChecked) {
+			return Show(null, name, password, saveChecked);
+		}
+
+		/// <summary>Shows the credentials dialog with the specified owner.</summary>
+		/// <param name="owner">The System.Windows.Forms.IWin32Window the dialog will display in front of.</param>
+		/// <returns>Returns a DialogResult indicating the user action.</returns>
+		public DialogResult Show(IWin32Window owner) {
+			return Show(owner, this.Name, this.Password, this.SaveChecked);
+		}
+
+		/// <summary>Shows the credentials dialog with the specified owner and save checkbox status.</summary>
+		/// <param name="owner">The System.Windows.Forms.IWin32Window the dialog will display in front of.</param>
+		/// <param name="saveChecked">True if the save checkbox is checked.</param>
+		/// <returns>Returns a DialogResult indicating the user action.</returns>
+		public DialogResult Show(IWin32Window owner, bool saveChecked) {
+			return Show(owner, this.Name, this.Password, saveChecked);
+		}
+
+		/// <summary>Shows the credentials dialog with the specified owner, name and password.</summary>
+		/// <param name="owner">The System.Windows.Forms.IWin32Window the dialog will display in front of.</param>
+		/// <param name="name">The name for the credentials.</param>
+		/// <param name="password">The password for the credentials.</param>
+		/// <returns>Returns a DialogResult indicating the user action.</returns>
+		public DialogResult Show(IWin32Window owner, string name, string password) {
+			return Show(owner, name, password, this.SaveChecked);
+		}
+
+		/// <summary>Shows the credentials dialog with the specified owner, name, password and save checkbox status.</summary>
+		/// <param name="owner">The System.Windows.Forms.IWin32Window the dialog will display in front of.</param>
+		/// <param name="name">The name for the credentials.</param>
+		/// <param name="password">The password for the credentials.</param>
+		/// <param name="saveChecked">True if the save checkbox is checked.</param>
+		/// <returns>Returns a DialogResult indicating the user action.</returns>
+		public DialogResult Show(IWin32Window owner, string name, string password, bool saveChecked) {
+			if ((Environment.OSVersion.Version.Major < 5) || ((Environment.OSVersion.Version.Major == 5) && (Environment.OSVersion.Version.Minor < 1))) {
+				throw new ApplicationException("The Credential Management API requires Windows XP / Windows Server 2003 or later.");
+			}
+			this.Name = name;
+			this.Password = password;
+			this.SaveChecked = saveChecked;
+		   
+			return ShowDialog(owner);
+		}
+
+		/// <summary>Confirmation action to be applied.</summary>
+		/// <param name="value">True if the credentials should be persisted.</param>
+		public void Confirm(bool value) {
+			switch (CREDUI.ConfirmCredentials(this.Target, value)) {
+				case CREDUI.ReturnCodes.NO_ERROR:
+					break;
+			   
+				case CREDUI.ReturnCodes.ERROR_INVALID_PARAMETER:
+					// for some reason, this is encountered when credentials are overwritten
+					break;
+			   
+				default:
+					throw new ApplicationException("Credential confirmation failed.");
+			}
+		}
+
+		/// <summary>Returns a DialogResult indicating the user action.</summary>
+		/// <param name="owner">The System.Windows.Forms.IWin32Window the dialog will display in front of.</param>
+		/// <remarks>
+		/// Sets the name, password and SaveChecked accessors to the state of the dialog as it was dismissed by the user.
+		/// </remarks>
+		private DialogResult ShowDialog(IWin32Window owner) {
+			// set the api call parameters
+			StringBuilder name = new StringBuilder(CREDUI.MAX_USERNAME_LENGTH);
+			name.Append(this.Name);
+
+			StringBuilder password = new StringBuilder(CREDUI.MAX_PASSWORD_LENGTH);
+			password.Append(this.Password);
+
+			int saveChecked = Convert.ToInt32(this.SaveChecked);
+
+			CREDUI.INFO info = GetInfo(owner);
+			CREDUI.FLAGS flags = GetFlags();
+
+			// make the api call
+			CREDUI.ReturnCodes code = CREDUI.PromptForCredentials(
+				ref info,
+				this.Target,
+				IntPtr.Zero, 0,
+				name, CREDUI.MAX_USERNAME_LENGTH,
+				password, CREDUI.MAX_PASSWORD_LENGTH,
+				ref saveChecked,
+				flags
+				);
+
+			// clean up resources
+			if (this.Banner != null) GDI32.DeleteObject(info.hbmBanner);
+
+			// set the accessors from the api call parameters
+			this.Name = name.ToString();
+			this.Password = password.ToString();
+			this.SaveChecked = Convert.ToBoolean(saveChecked);
+
+			return GetDialogResult(code);
+		}
+
+		/// <summary>Returns the info structure for dialog display settings.</summary>
+		/// <param name="owner">The System.Windows.Forms.IWin32Window the dialog will display in front of.</param>
+		private CREDUI.INFO GetInfo(IWin32Window owner) {
+			CREDUI.INFO info = new CREDUI.INFO();
+			if (owner != null) info.hwndParent = owner.Handle;
+			info.pszCaptionText = this.Caption;
+			info.pszMessageText = this.Message;
+			if (this.Banner != null) {
+				info.hbmBanner = new Bitmap(this.Banner, ValidBannerWidth, ValidBannerHeight).GetHbitmap();
+			}
+			info.cbSize = Marshal.SizeOf(info);
+			return info;
+		}
+
+		/// <summary>Returns the flags for dialog display options.</summary>
+		private CREDUI.FLAGS GetFlags() {
+			CREDUI.FLAGS flags = CREDUI.FLAGS.GENERIC_CREDENTIALS;
+
+			if (this.AlwaysDisplay) {
+				flags = flags | CREDUI.FLAGS.ALWAYS_SHOW_UI;
+			}
+
+			if (this.ExcludeCertificates) {
+				flags = flags | CREDUI.FLAGS.EXCLUDE_CERTIFICATES;
+			}
+
+			if (this.Persist) {
+				flags = flags | CREDUI.FLAGS.EXPECT_CONFIRMATION;
+				if (this.SaveDisplayed) {
+					flags = flags | CREDUI.FLAGS.SHOW_SAVE_CHECK_BOX;
+				} else {
+					flags = flags | CREDUI.FLAGS.PERSIST;
+				}
+			} else {
+				flags = flags | CREDUI.FLAGS.DO_NOT_PERSIST;
+			}
+
+			if (this.KeepName) {
+				flags = flags | CREDUI.FLAGS.KEEP_USERNAME;
+			}
+
+			return flags;
+		}
+	   
+		/// <summary>Returns a DialogResult from the specified code.</summary>
+		/// <param name="code">The credential return code.</param>
+		private DialogResult GetDialogResult(CREDUI.ReturnCodes code) {
+			DialogResult result;
+			switch (code) {
+				case CREDUI.ReturnCodes.NO_ERROR:
+					result = DialogResult.OK;
+					break;
+				case CREDUI.ReturnCodes.ERROR_CANCELLED:
+					result = DialogResult.Cancel;
+					break;
+				case CREDUI.ReturnCodes.ERROR_NO_SUCH_LOGON_SESSION:
+					throw new ApplicationException("No such logon session.");
+				case CREDUI.ReturnCodes.ERROR_NOT_FOUND:
+					throw new ApplicationException("Not found.");
+				case CREDUI.ReturnCodes.ERROR_INVALID_ACCOUNT_NAME:
+					throw new ApplicationException("Invalid account name.");
+				case CREDUI.ReturnCodes.ERROR_INSUFFICIENT_BUFFER:
+					throw new ApplicationException("Insufficient buffer.");
+				case CREDUI.ReturnCodes.ERROR_INVALID_PARAMETER:
+					throw new ApplicationException("Invalid parameter.");
+				case CREDUI.ReturnCodes.ERROR_INVALID_FLAGS:
+					throw new ApplicationException("Invalid flags.");
+				default:
+					throw new ApplicationException("Unknown credential result encountered.");
+			}
+			return result;
+		}
+	}
+
+	public sealed class GDI32 {
+		private GDI32() {
+		}
+
+		[DllImport("gdi32.dll", EntryPoint="DeleteObject")]
+		public static extern bool DeleteObject(IntPtr hObject);
+	}
+
+	public sealed class CREDUI {
+		private CREDUI() {
+		}
+
+		/// <summary>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/authentication_constants.asp</summary>
+		public const int MAX_MESSAGE_LENGTH		= 100;
+		public const int MAX_CAPTION_LENGTH		= 100;
+		public const int MAX_GENERIC_TARGET_LENGTH = 100;
+		public const int MAX_DOMAIN_TARGET_LENGTH  = 100;
+		public const int MAX_USERNAME_LENGTH	  = 100;
+		public const int MAX_PASSWORD_LENGTH	  = 100;
+
+		/// <summary>
+		/// http://www.pinvoke.net/default.aspx/Enums.CREDUI_FLAGS
+		/// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/html/dpapiusercredentials.asp
+		/// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/creduipromptforcredentials.asp
+		/// </summary>
+		[Flags] public enum FLAGS {
+			INCORRECT_PASSWORD		  = 0x1,
+			DO_NOT_PERSIST			  = 0x2,
+			REQUEST_ADMINISTRATOR	  = 0x4,
+			EXCLUDE_CERTIFICATES		= 0x8,
+			REQUIRE_CERTIFICATE		= 0x10,
+			SHOW_SAVE_CHECK_BOX		= 0x40,
+			ALWAYS_SHOW_UI			  = 0x80,
+			REQUIRE_SMARTCARD		  = 0x100,
+			PASSWORD_ONLY_OK			= 0x200,
+			VALIDATE_USERNAME		  = 0x400,
+			COMPLETE_USERNAME		  = 0x800,
+			PERSIST					= 0x1000,
+			SERVER_CREDENTIAL		  = 0x4000,
+			EXPECT_CONFIRMATION		= 0x20000,
+			GENERIC_CREDENTIALS		= 0x40000,
+			USERNAME_TARGET_CREDENTIALS = 0x80000,
+			KEEP_USERNAME			  = 0x100000,
+		}
+
+		/// <summary>http://www.pinvoke.net/default.aspx/Enums.CredUIReturnCodes</summary>
+		public enum ReturnCodes {
+			NO_ERROR					= 0,
+			ERROR_INVALID_PARAMETER	= 87,
+			ERROR_INSUFFICIENT_BUFFER  = 122,
+			ERROR_INVALID_FLAGS		= 1004,
+			ERROR_NOT_FOUND			= 1168,
+			ERROR_CANCELLED			= 1223,
+			ERROR_NO_SUCH_LOGON_SESSION = 1312,
+			ERROR_INVALID_ACCOUNT_NAME  = 1315
+		}
+
+		/// <summary>
+		/// http://www.pinvoke.net/default.aspx/Structures.CREDUI_INFO
+		/// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/credui_info.asp
+		/// </summary>
+		public struct INFO {
+			public int cbSize;
+			public IntPtr hwndParent;
+			[MarshalAs(UnmanagedType.LPWStr)] public string pszMessageText;
+			[MarshalAs(UnmanagedType.LPWStr)] public string pszCaptionText;
+			public IntPtr hbmBanner;
+		}
+
+		/// <summary>
+		/// http://www.pinvoke.net/default.aspx/credui.CredUIPromptForCredentialsW
+		/// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/creduipromptforcredentials.asp
+		/// </summary>
+		[DllImport("credui", EntryPoint="CredUIPromptForCredentialsW", CharSet=CharSet.Unicode)]
+		public static extern ReturnCodes PromptForCredentials(
+			ref INFO creditUR,
+			string targetName,
+			IntPtr reserved1,
+			int iError,
+			StringBuilder userName,
+			int maxUserName,
+			StringBuilder password,
+			int maxPassword,
+			ref int iSave,
+			FLAGS flags
+		);
+
+		/// <summary>
+		/// http://www.pinvoke.net/default.aspx/credui.CredUIConfirmCredentials
+		/// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthn/security/creduiconfirmcredentials.asp
+		/// </summary>
+		[DllImport("credui.dll", EntryPoint="CredUIConfirmCredentialsW", CharSet=CharSet.Unicode)]
+		public static extern ReturnCodes ConfirmCredentials(string targetName, bool confirm);
+	}
+}
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