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Incorrect DOS version
Explanation: DOS is refusing to run the program that you asked it to run because the version number of the program is different than the version number of DOS that you used to boot up the system.
Diagnosis: DOS is especially finicky about refusing to run DOS commands and programs that are not the exact same version as what is loaded on the PC. This is designed to prevent problems that might occur if you ran an older utility on a newer version of DOS where things might have changed. The DOS commands are programmed to check the current version and produce this error message if there is a mismatch.