Acngen.exe |top| ⇒

and does not pose a security risk. However, because the name is not widely recognized, malware authors sometimes use identical or similar filenames to disguise malicious code.

Legitimate acngen.exe files are not viruses. They are safe. acngen.exe

If you do not use IBM/Lotus products, uninstall the software entirely. and does not pose a security risk

Here are some key functions of acngen.exe : acngen.exe

Any other (like 4005 or 1603) that appear alongside the crash.