Restoring from a Backup File

AutoLISP Developer's Guide > Using the Visual LISP Environment > Developing Programs with Visual LISP > Using the Text Editor > Editing a File >

If a backup file exists, you can restore the file you are editing to its original content, reversing all the changes you made. From the File menu, choose Revert to restore the file. If there is no backup file for the text in the editor window, VLISP displays an error message.