When saving a user-created model file, if the file exists, prompt the user to overwrite the existing file, rename the existing file, or cancel and not write the new file.
Renaming scheme: just append a .1, .2, etc. to the filename and rename the existing file.
When saving a user-created model file, if the file exists, prompt the user to overwrite the existing file, rename the existing file, or cancel and not write the new file.
Renaming scheme: just append a
.1,.2, etc. to the filename and rename the existing file.