To unprotect "Contraptions" and allow it to be used from hard disk: Copy CONTRAP.EXE a new disk or directory. Also copy all the *. files, e.g. copy contrap.exe b: copy *. b: Then, using DEBUG (in drive A): > b: B> rename contrap.exe *.x B> a:debug contrap.x - u 5d6d L 2 xxxx:5D6D CD13 INT 13 Note: If the above line does not show the indicated contents, then do not proceed with this patch. - a 5d6d xxxx:5D6D jmp 5d71 xxxx:5D70 - a 5d9f xxxx:5D9F mov di,3 xxxx:5DA2 jmp 5dd5 xxxx:5DA5 - w Writing B7A4 Bytes - q B> rename contrap.x *.exe