Symptom

How can I find out which release version was used to save a Version file?

Resolution

Use a text editor to open the Version file. It will show its binary content, but its first line holds ASCII characters showing the release and servicepack number, and reads for example like:
PTVSYSTEM VISUM Version Vers. 18.01-2 Rev.134410

Tip: Use a powerful text editor like TextPad or use TotalCommander, offering with Lister a small size text viewer (use the F3 key), capable of showing content already before loading the complete file.

Since Visum 2021 version files are saved in an archived format. They can be opened with 7-zip or other ZIP programs. Release and servicepack number is shown in VersionHeader.bin.