I think it might just be better to provide a standalone portable MS-DOS Editor rather than having to install NTVDMx64 for 64-bit Windows users.
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It will create a temp file in the working directory so make sure that directory is not write protected. Some characters might not show correctly but I don't think that is a big issue. It can run within Command Prompt or standalone. The other good thing is it can interact with your system so you can copy text using notepad and paste into Edit or vice versa.
Running in Command Prompt:
Running standalone:
Hope you like it,
SnowBall