However, changing the NTVDM.EXE is problematic, since a sfc /scanonce can undo the patch--or a windows update.

http://support.microsoft.com/kb/222193/

I'm now testing the RunFirst utility at
http://www.activeplus.com/us/freeware/runfirst/
With the RunFirst.EXE "FOXR.EXE -t-cConfig.C MyApp.App"
in my PIF file, it seems to work, but I have to check further.

>Thanks.
>
>>
>>http://www.markwilson.co.uk/blog/2005/01/troubleshooting-ms-dos-application.htm
>>
>>This blog entry seems to be right on this point. We recently got new machines, dual core, and instantly noticed lockups. With the updated NTVDM, (where the processor affinity is set for CPU0, the lockups disappeared.