How to tell Int201i IntelliSense to ignore .glsl files

Question

I have a C ++ VS2010 solution that also has .glsl shader files (I use Visual Studio and NShader syntax syntax to edit them).
However, my VS2010 Error List window constantly lists 100 errors associated with these .glsl files (the most common error: "IntelliSense: cannot open source xxx.glsl file" - because of #include in my .glsl file.

How can I tell IntelliSense to ignore files with this extension (since it cannot process them)?