In addition to the debug folder in the project folder, you can delete the following files: .ncb: No Compile Browser. This file can be deleted when the function is automatically completed. BUILD will be automatically generated. .Aps: binary version of the RC file for quick load; .clw: classwizard is used to save the information of the class ;.Opt: Engineering on the development environment parameter file. Such as information such as tool bar position; .plg: Error and Warning information files (actually an HTML file). .rc ~: Temporary file generated when compiling RC .tmp: # ^ & (& ^% $ ^% & mfm1992: I don't know how to generate the file! It seems to be the information about dialogs ... Any, the younger brother never Outburs.