Many editors and word processors save an edited file by renaming the old file "filename.bak" and then writing a new "filename.ext". Others make a copy of the existing for the backup and modify the old one.
With DOS and Windows which look at the filename this is not an issue.
But if you have an operating system like OS/2 which tracks the actual files as objects, and you use an editor like Edlin or a wordprocessor to edit a file which appears on your desktop, the icon may stay pointed at the original file, even though its filename has a new extension. This means that it is far better to use a native OS/2 editor for editing REXX scripts (.CMDs) and the like. (For non OS/2 users, REXX is a very powerful batch language, now also supported by IBM's PC-DOS.)
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© Julian Sortland, June 1997.