According to one of the answers in to Visual Studio (2008) 'Clean Solution' Option, the visual studio clean command deletes files of the following types:
*.obj - object code
*.pdb - program debug databse file
*.bsc - source browser database
*.ilk - incremental linker file
*.sbr - source browser intermediate file
*.idb - rebuild dependency file
*.lib - library file
*.exe - executable
Can additional file types be added to this list manually, and in that case how?