Language: C# 2.0 or later
I would like to register context handlers to create menues when the user right clicks certain files (in my case *.e
Resist writing Shell Extensions in managed languages - there are a multitude of things that could go bang if you pursue this route.
Have a browse through this thread for more details. It contains links to do it if really want, and sagely advice of why it can be done, but shouldn't.
http://social.msdn.microsoft.com/Forums/en-US/netfxbcl/thread/1428326d-7950-42b4-ad94-8e962124043e/
You're back to unmanaged C/C++ as your only real tools here.