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App. - 2
IM 4N1A1-11E
Appendix 2 File Naming Rules
File Name Length
Data file: Up to seven alphanumeric characters
Configuration (parameter settings) file: Up to eight alphanumeric characters
Lowercase/Uppercase Letters
All lowercase letters are processed as uppercase letters for file names, based on the rules
of MS-DOS.
System-reserved File Names
The following system-reserved file names cannot be used for a user-defined file name:
CON, PRN, AUX, AUX1, AUX2, NUL, CLOCK.
Prohibited Characters
The following characters cannot be used:
• Any character not included in the 7-bit ASCII codes
• \ (back slash), ? (question mark), * (asterisk), . (period), <, > (inequality signs), “
(quotation mark), = (equals sign), [, ] (bracket), : (colon), ; (semicolon), + (plus sign),
/ (slash), | (vertical bar), ¥ (yen mark), space