FileManager was made as the main module of the EGI, much the same as a Windows 9x file manager. It is impressive by its time, 1987, but it has some flaws, mainly because the Enterprise has evolved some along the years...
It is not a real windows operative system like SymbOS is, but almost all the file operations can be made only with a click.
It can't deal with drive letters beyond E:, but this can be avoided with an easy assign.
The language roms(BRD, HUN, ESP) are incompatible with FMAN, not with the EGI, but you can solve it executing :UK.
The worst of the flaws is the incompatibility of the File Manager with the superb ZozoTools.
I think I know why a Dir with ZT is different and left out of square the DIR on FMAN.EGI.
ZT make the DIR lines one character shorter than normal, as them work with 24 hour clock. ZT don't need the P of Past Meridiam that a 12 hours clock has.
You can see it on the two first snapshots.
Then FMAN assumes the same length than normal and the lines are printed out mis-aligned.