Why does NTVDM create empty IO.SYS and MSDOS.SYS files?

Raymond Chen

A:-)Brunuś asks why NTVDM creates empty IO.SYS and MSDOS.SYS every time it starts up.

For compatibility, of course.

Specifically, it was added for one particular program that searched for the MS-DOS system files, and if they are missing, it got confused and corrupted your CONFIG.SYS file.

This reminds me of another program we discovered in Windows 95 that parsed your SYSTEM.INI file, and if any line in that file was longer than 80 characters, it deleted your SYSTEM.INI file outright. That’ll teach ya.


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