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- EXTENSION
-
- A filename may be followed by a period and up to three letters, called
- the extension. Frequently encountered extensions are .TXT, .EXE, and
- .BAT.
-
- FILENAME.EXT
- / \
- filename extension
-
- Extensions can include letters (A through Z) and numbers (0 through 9). "A"
- and "a" are equivalent in an extension. Other characters such as !, #, $, and
- _ can be used, but occasionally some program may object. DOS 4.0 users can
- include many of the international characters in filenames. The DOS special
- characters listed in the NEW_TERMS SPECIAL_CHARACTERS definition should not
- be used.