diff --git a/Greenshot/Greeenshot.zreproj b/Greenshot/Greeenshot.zreproj
deleted file mode 100644
index fd45c68c8..000000000
--- a/Greenshot/Greeenshot.zreproj
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version='1.0' encoding='utf-8'?>
-<project>
-  <configuration createBackupFiles="False" hideEmptyRows="False" useSpellChecker="True" neutralLanguageCode="en-US">
-    <userSetting name="thomas@thomas-PC.filesInitialDir">C:\Projects\Greenshot</userSetting>
-    <userSetting name="thomas@thomas-PC.FindText">
-    </userSetting>
-    <userSetting name="thomas@thomas-PC.RecentFiles">C:\Projects\Greenshot\UI.resx;C:\Projects\Greenshot\UI.de-DE.resx</userSetting>
-    <description>
-    </description>
-  </configuration>
-  <fileGroups />
-  <projectFolders />
-</project>
\ No newline at end of file
diff --git a/GreenshotBoxPlugin/GreenshotBoxPlugin.csproj b/GreenshotBoxPlugin/GreenshotBoxPlugin.csproj
index 28aaac5b7..e3153710d 100644
--- a/GreenshotBoxPlugin/GreenshotBoxPlugin.csproj
+++ b/GreenshotBoxPlugin/GreenshotBoxPlugin.csproj
@@ -13,8 +13,6 @@
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
     <RunPostBuildEvent>OnBuildSuccess</RunPostBuildEvent>
-    <OldToolsVersion>3.5</OldToolsVersion>
-    <UpgradeBackupLocation />
     <TargetFrameworkProfile />
   </PropertyGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.Targets" />
diff --git a/GreenshotConfluencePlugin/GreenshotConfluencePlugin.csproj b/GreenshotConfluencePlugin/GreenshotConfluencePlugin.csproj
index 126474b15..0a7efd043 100644
--- a/GreenshotConfluencePlugin/GreenshotConfluencePlugin.csproj
+++ b/GreenshotConfluencePlugin/GreenshotConfluencePlugin.csproj
@@ -15,10 +15,6 @@
     <RunPostBuildEvent>OnBuildSuccess</RunPostBuildEvent>
     <TargetFrameworkProfile>
     </TargetFrameworkProfile>
-    <FileUpgradeFlags>
-    </FileUpgradeFlags>
-    <OldToolsVersion>3.5</OldToolsVersion>
-    <UpgradeBackupLocation />
   </PropertyGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.Targets" />
   <ItemGroup>
diff --git a/GreenshotDropboxPlugin/GreenshotDropboxPlugin.csproj b/GreenshotDropboxPlugin/GreenshotDropboxPlugin.csproj
index aa67490e7..d695b8b84 100644
--- a/GreenshotDropboxPlugin/GreenshotDropboxPlugin.csproj
+++ b/GreenshotDropboxPlugin/GreenshotDropboxPlugin.csproj
@@ -13,7 +13,6 @@
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
     <RunPostBuildEvent>Always</RunPostBuildEvent>
-    <OldToolsVersion>3.5</OldToolsVersion>
     <TargetFrameworkProfile />
   </PropertyGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.Targets" />
diff --git a/GreenshotExternalCommandPlugin/GreenshotExternalCommandPlugin.csproj b/GreenshotExternalCommandPlugin/GreenshotExternalCommandPlugin.csproj
index d5450bf0b..08dab60e7 100644
--- a/GreenshotExternalCommandPlugin/GreenshotExternalCommandPlugin.csproj
+++ b/GreenshotExternalCommandPlugin/GreenshotExternalCommandPlugin.csproj
@@ -13,10 +13,6 @@
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
     <RunPostBuildEvent>OnBuildSuccess</RunPostBuildEvent>
-    <FileUpgradeFlags>
-    </FileUpgradeFlags>
-    <OldToolsVersion>3.5</OldToolsVersion>
-    <UpgradeBackupLocation />
     <TargetFrameworkProfile />
   </PropertyGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.Targets" />
diff --git a/GreenshotInterop/GreenshotInterop.csproj.user b/GreenshotInterop/GreenshotInterop.csproj.user
index 695b5c78b..b099bcb03 100644
--- a/GreenshotInterop/GreenshotInterop.csproj.user
+++ b/GreenshotInterop/GreenshotInterop.csproj.user
@@ -1,3 +1,3 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="3.5" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 </Project>
\ No newline at end of file
diff --git a/GreenshotPlugin/GreenshotPlugin.csproj b/GreenshotPlugin/GreenshotPlugin.csproj
index cbba0de09..c7097b2ef 100644
--- a/GreenshotPlugin/GreenshotPlugin.csproj
+++ b/GreenshotPlugin/GreenshotPlugin.csproj
@@ -14,10 +14,6 @@
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
     <TargetFrameworkProfile />
-    <FileUpgradeFlags>
-    </FileUpgradeFlags>
-    <OldToolsVersion>3.5</OldToolsVersion>
-    <UpgradeBackupLocation />
   </PropertyGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.Targets" />
   <ItemGroup>