Has this file been quarantined by your anti-virus software?
If so then maybe you can restore it.
If not all I can thing of is to reapply the hotfix or possibly even Archicad and then the hotfix again.
I am in a habit of duplicating and renaming my Archicad program folder before I apply a hotfix.
That way I always have the original un-hotfixed version I can fall back on if I need to.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10