Does it have the right file access rights? If it's in a "program files" folder normal users don't have write access. (I know you wrote that it isn't read only but that may not cover for user rights)

I'm an Administrator on the PC, shouldn't it have problem with writing privileges ? i even tried running DOSbox with "run as administrator"

Don't install the game in Program Files to avoid issues with UAC.

UAC is disabled and the game is installed in D:\ partition

I'll assume that you have not overlooked something like the file is set to read only. Make sure that all file names and paths conform to the DOS 8.3 naming convention. Outside of this, the only other thing that I can think of is that it may be looking for a 2nd file that you missed placing in the folder.

It runs fine in 32-bit Win 7
so i did this before, no missing file i'm sure of this.

I did something new now, i launched Windows 98SE on VMware and took the files there, the cmd windows said "File Patched Successfully"
but i don't know it gives "don't send" window when i put them in the game installation folder. like the Win98 corrupted the file or the cmd wrote different code for Win98 or something.

everything was working fine in the 32-bit 7 😒

If you people wish, i can attach both files here for you to try
maybe i'm not using DOSbox properly.

A possible reason could be that the patch was meant for the Windows command prompt and not real dos.

But wouldn't that still throw the requires Windows error?

Hmm, yeah, you are right 😉
Maybe it does something you can only do on the Windows command prompt?

Dominus wrote:

Hmm, yeah, you are right 😉
Maybe it does something you can only do on the Windows command prompt?

Nope, as i said it's 64-bit problem

The problem with Dosbox is not a 64bit problem.
That the program doesn't run in 64bit Windows doesn't negate what I wrote.

The patching program (ONIMU102.COM) is unable to open the executable file for patching because it uses LFN functions that are not implemented in DOSBox. Kind of strange that .COM format was chosen for a program released in 2007 that patches a Win32 executable... Anyway, maybe you can get it to work in DOSBox if you boot Win9X (not recommended) or DOS 7, but then you could use other VMs with about as much hassle.

Or simply change the paths as I said earlier to "make sure that all file names and paths conform to the DOS 8.3 naming convention".

Did it in VMware and paste the patched .exe into the game.
the game runs now!
Though this method works, but it's require much more time. Wish DOSbox could make it more easier on me.

Anyway thanks everyone for your valuable time in this case.

I might be wrong, but can't you just keep the patched exe around forever and be done with having to patch it again and again?

Yeah that's what i just did, put it in a folder for future installation 😀

collector wrote:

Or simply change the paths as I said earlier to "make sure that all file names and paths conform to the DOS 8.3 naming convention".

The files involved are already 8.3, but the filenames have nothing to do with the fact that the program is calling LFN functions that don't exist in DOS 5 or 6 (and therefore are not implemented in DOSBox).

It looked like he was mounting a folder that had sub directories with long file names.