Error during compare of Word 2016 files

[Torsten]

TortoiseSVN 1.12.0, Build 28568 - 64 Bit , 2019/04/16 18:42:29
Microsoft Windows 10 Pro (Version 1809)
Microsoft Word 2016 - MSO (16.0.4849.1000) 32-bit

After migrating from Windows 7 to Windows 10, comparing different versions of a Microsoft Word file with TortoiseSVN fails.
In Windows Explorer, right-click on a modified file -> TortoiseSVN -> Diff, will pop up a window with the message "Windows Script Host - Error comparing work and temp", with work and temp being the path-extended file names of the working copy file and a temporary file, respectively.
Also, just before the Error message pops-up, a Word window opens showing the temp-file in Read-Only mode.
Clicking O.K. on the error message window will close the error message as well as the Word temp file, leaving behind an empty Word window.

I found the following bug report which seems similar:
https://superuser.com/questions/521743/word-2013-cant-compare-readonly-files

However, this case seems to be different, e.g. for me the work and the temp file are write-able.

How can I debug this further - thanks.