See my article:
HOWTO: Get the language of a project or file from a Visual Studio .NET macro
or add-in.
at
http://www.mztools.com/resources_vsnet_addins.htm
There are many other resources there to get you started.

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Best regards,
Carlos J. Quintero
MZ-Tools: Productivity add-ins for Visual Studio
You can code, design and document much faster:
http://www.mztools.com
> Hi all,
> I am a newbie on VS extensibility. My goal is to integrate two more Tool
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> Best regards,
> Andrea