What you have is the version 2 VSIX manifest, which is not compatible with Visual Studio 2010. Later Visual Studio versions respect version 1 of the manifest, so in order to support all 3 Visual Studio versions with a single manifest, you’ll have to convert it to v1.0 manually (and make sure NOT to edit it with VS2012+, otherwise it will be converted back to v2.0).
Something like this:
<?xml version="1.0" encoding="utf-8"?>
<Vsix xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Version="1.0.0" xmlns="http://schemas.microsoft.com/developer/vsx-schema/2010">
<Identifier Id="ae98c9e5-8e14-4c92-b45a-c4fd24a49123">
<Name>MyExtension</Name>
<Author>whosoever</Author>
<Version>1.0</Version>
<Description xml:space="preserve">Your decription.</Description>
<Locale>1033</Locale>
<SupportedProducts>
<VisualStudio Version="10.0">
<Edition>Pro</Edition>
</VisualStudio>
<VisualStudio Version="11.0">
<Edition>Pro</Edition>
</VisualStudio>
<VisualStudio Version="12.0">
<Edition>Pro</Edition>
</VisualStudio>
</SupportedProducts>
<SupportedFrameworkRuntimeEdition MinVersion="4.0" />
</Identifier>
<Content>
<VsPackage>|%CurrentProject%;PkgdefProjectOutputGroup|</VsPackage>
<MefComponent>|%CurrentProject%|</MefComponent>
</Content>
</Vsix>
You don’t have to specify all product editions (called SKUs), Pro
is enough, if, say, Ultimate
is installed, it will be displayed instead.