Information about the .old (old) file type

Below is all the information we have available on file about the .old (old) file type.

.old
Generic file extension used to denote an old or backup file. Typically a .old file represents an earlier version of a file. Sometimes .old is used to replace the original file extension, other times it may be appended as an additional file extension.

Where this is available we would like to include file format information on .old files, as well as information on how to view or open files of type .old. If you know of any information which we have missed then please let us know.