yep, that is clearly the most logical way to abbreviate those file names, I see nothing wrong with this
Windows
DATEINAME(8.3) 3.X 95/NT Langer Dateiname (Win 95/NT)
-------------- ---- ----- ----------------------------
Dat_Ass.EXE X X Datenfelder-Assistent.EXE
Org_Ass.EXE X X Organigramm-Assistent.EXE
Source: Visio 4.0 (German), Diskette 1, Lesen.TXT
(idk, maybe this isn't even specific to the German version? I just like to imagine some mid-1990s translators choosing these names with a huge grin, knowing exactly that nobody is proofreading this sort of thing)