Adding Items to Windows 7 Context Menu

[Gmod4ever]

Right. This is a simple one.

I have a program that I wrote in C#, stored in [b]C:/Tools/UETextureConvert/UETextureConvert_Singular.exe[/b]. I want to make it so that when I right-click a file that ends in [b].mat[/b], there is an option in the main context menu that says "UE Configure", that runs this program.

I have followed this tutorial, and a few others like it: [url]http://stackoverflow.com/questions/2123762/add-menu-item-to-windows-context-menu-only-for-specific-filetype/2124396#2124396[/url]

I have this C# code that I run:

            Registry.SetValue(@"HKEY_CURRENT_USER\Software\Classes\uemat\shell\configure\command", "UE Configure", @"""C:\Tools\UETextureConvert\UETextureConvert_Singular.exe"" ""%1""");
            Registry.SetValue(@"HKEY_CURRENT_USER\Software\Classes\.mat", null, "uemat");
            Registry.SetValue(@"HKEY_CLASSES_ROOT\.mat", null, "uemat");

But after running it, nothing changes. Files that end in [b].mat[/b] have no new options.

Can anyone help me out? Thanks.