(Dutch:) Dit programma vertoont mogelijk ongewenst gedrag.

[Makzie_mie]

Hello,

I got a couple of records in the Windows Defender history, saying (in Dutch):
Beschrijving:
Dit programma vertoont mogelijk ongewenst gedrag.

Advies:
Sta het gedetecteerde item alleen toe als u het programma of de
software-uitgever vertrouwt.

Windows Defender refers to an -normal!- application that our company has
made in-house. Any clue why this message appears and how to prevent it
occuring in the future?

Kind regards,
Erik

 

[Jean Rosenfeld]

It will flag that for any software it does not know about.