No, they do not get deleted from RailPro Assistant when you copy them to the accessory module so it should still be there in RPA, unless you accidentally deleted it. The only other possibility that I can think of, which is a long shot as it's been years since I've seen something along these lines so I may be remembering wrong is although you "saved" it (you had to to be able to load it to a module) it actually wasn't saved to disk due to write permissions, or the storage file is full. If other stuff you've written / downloaded has remained in RPA after you've closed and reopened RPA then write permissions isn't the problem. Is your storage file full ? (RPA gives a percent free indicator).
- Tim