If selected Use Windows folder thumbnails where possible
The regular expressions in the thumbnails\style will fail
For example：
Use Windows folder thumbnails where possible√ regular expressions× work
Those options only apply when Opus is generating the thumbnails.
If Windows generates them, it has no knowledge of those settings, as they are not something Windows supports.
That isn’t a bug, it’s just differences in how two things work.
However, it is effective to match the file name directly, even in the case of Windows generating thumbnails, but the regular expression does not take effect.
I see what you mean. Yes, there are some quirks with how Folder Thumbnail Styles work w.r.t. regex vs names, in general. I think the different rule types are checked at different times (which can mean another setting takes precedence), but haven't looked at the code in detail to confirm that.
It's on our list of things to improve.
