saving idf files

Paul,
When I open an idf file in CW, and then close it, it prompts mewhether I want to save it or not. If I don't save it, close it, andthen open it again the file has changed. If I try to use a new"current folder scheme" it doesn't work because it remembers wheresome parts are. Can you explain that? I've started keeping a cleancopy in reserve as a result. Is there an explanation somewhere ofthe idf save/don't save function?
AlanSolidworksCircuitworks