By the way, you can use "ver set" in order to set the minor revision of DOS. E.g. if you'd like to set DosBox to DOS version 6.22 instead of version 6.0, you can use the following: ver set 6 22 Thanks. Now my problem is focused on how to figure out the necessary DOS version of an App, like this …

wd wrote: Checksum? File Date? Oh, I see. thank you.

How can hardcoded tables distinguish the same app of two versions ? Does it like the AntiVirus program, it can distinguish them by analysing their "condition code" in the bin file. 😅

I guess different DOS distribution has different "more.exe", they all have the same named app (more.exe), the apps working on different dos version. e.g. the more.exe of dos ver 5.0 should not be permitted to run on dos ver 6.0, and vice versa. So, for a program like more.exe, dosver.exe should has …

dosbox has a builtin version changing utiliy, for what it's worth: "ver set 6" (or something like that) Yes, you are right. But dosver.exe is intelligent. e.g. through the dosver.exe, I can run the more.com in attachment directly, and I can't find which version I shsould set to run it through "ver …

the solution is use dosver.exe. homepage of dosver : google it, and it's a shareware, needs register. the freeware version dosver.exe :