Hi I'm trying to convert a linux/gcc program to windows/cl

But I'm having some problems understanding the inner workings of the ide called microsoft visual studio c++ 2008 express.

I've started a "new clr project", and then added the .hpp file,
that contains the header.
But the compiler/f7 says that it cant find the file even though it appers in the solution explorer.
below is a screenshot.

btw I've tried dragging the file from source files to header files,
and still doesn't work.

Do I have to set som strange compiler include even though a file appers the the solution explorer


http://img87.imageshack.us/img87/8973/danilq5.jpg

thanks