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2-2 DOS Basics
File names range from one to eight characters in length and consist of
any combination of letters, numbers, and the following symbols:
Underscore _ Ampersand &
Caret ^ Hyphen -
Dollar sign $ Braces { }
Tilde ~ Parenthesis ( )
Exclamation point ! At sign @
Number sign # Apostrophe ‘
Percent sign %
File name Extensions
The second part of the file name is the file name extension. The file
name extension has one, two, or three characters and may use the same
symbols as the file name
.
A file name extension is not required, although
file name extensions can be helpful in identifying the type of file.
Commonly used file name extensions include .DOC for documents, .DAT
for data, and .TXT for text files.
You may use any file name extension you choose. However, certain file
name extensions have a special meaning to ROM-DOS and should only
be used when appropriate. These include:
.COM used for executable files
.EXE used for executable files
.BAT used for batch files
Some application programs, such as word processors, may use or require
particular file name extensions for output or input files. It is best to follow
the application instructions regarding proper file name extensions for that
particular program. For example, a file named LETTER1 may include a
file name extension such as LETTER1.DOC or LETTER1.TXT.