I've been ignoring this problem for some time, but it's time to fix it.
If I execute, from the command prompt-
\masm32\bin\ml615.exe -c -coff -Cp -Fltestmasm.lst -Sn -Sg test.asm
and there is an error in the program, I keep getting the above error A4910.
I am running as administrator with all permissions.
I have checked the security permissions on \masm32, and all looks good.
This is windows 10 pro.
I don't see a switch saying where to write the .err file if one is needed.
Any suggestions?
I suggest you use this one. Extract to \Masm32\bin 8)
Ah. It all becomes clear now.
I was misinterpreting the error comment as meaning it couldn't open the .err file for writing.
And now that I think back, some time ago I tried out a disk cleanup routine. It helpfully deleted all .err files it found!