mw.hlp (Topic list)
Important Notice
The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
dExtension
Extension
 
The last three characters of a filename including
the period. For example, in the filename
EXAMPLE.DOC, the extension .DOC is short for
document. Extensions are an efficient way to
distinguish the contents of files without having
to open each file. See also: Filename.