Thanks, answers to your questions were already described above. I used the workflow suggested by @Vero in this topic below. Note again, the Finder's spotlight can find these files properly and as diagnosed above, Alfred has access to them. Note, maybe that's just a problem with workflow posted by @Vero.
Edit: I've created video to show the issue. Note, when I typed full file name libpylon_TL_gtc.so then it was found, but not when I typed just a part of the file name, nor the VST folder.