From this statement its obvious you are trying to ResEdit the wrong Application you should do this on UserManager not tfs.
Also it would be more dodgy using ResEdit particularly if you are not sure which files to patch. Where as ResCompare will actually check first that it is the correct file and generates a new Application from the original, you just can't be 100% be sure (Sorry but thats the legal system).
Most patches and programs as well generally do contain some disclaimer within the licence
