to retrive 'special' folders i use:

DECLARE INTEGER SHGetFolderPath ;
	IN SHFOLDER.DLL ;
	INTEGER hwndOwner, ;
	INTEGER nFolder, ;
	INTEGER hToken, ;
	INTEGER dwFlags, ;
	STRING @ pszPath

if you look in msdn help for this function and the 'shlfolder.h' file, that should give you what you need.