User's Manual

Naming a File
Each file requires a unique filename. The filename consists of
two parts: the file’s name and the file’s extension.
You can use up to eight characters in a filename. Create a name
that identifies the information the file contains. The name can
contain any characters or numbers except for blank spaces and
the following symbols:
*\/{}:I<>+=;.?
The file extension is optional and can be up to three characters
long. You can use these characters to describe what type of file
it is, such as a text file or program file. Some application pro-
grams add extensions to the files you create. The application
program uses the extension to determine whether it is a compat-
ible data file. Avoid using the same extensions your application
programs use. When you use an extension, separate it from the
file’s name with a period. For example, an MS-DOS filename
might look like this:
DATA.TXT
Do not use uppercase and lowercase letters to distinguish
between files. MS-DOS does not recognize the difference and
displays filenames in uppercase.
Using MS-DOS with Your Apex 3-5