Ok I didn't know about of that EXDOS modified rom. In that case you must assign also the H: disk to A:. It is the more important thing as if not the EGI insists on searching its system files on A: and hangs.
Write "assign a: h:" an then "assign b: f:"(or the partition you want to manage) the very first lines of EXDOS.INI and leave all the following paths as in the original file.
But if your EP got instaled a HUN.rom or a BRD.rom, fman.egi will hang.....
To ensure that all is well, change the last line of EXDOS.INI " load \egi.sys\fman.egi" to "load \progs\icon.egi".
It then will jump directly to the demo app "icon editor".
We must wait for a programmer to fix that fman app.