Right hint but the solution is a little bit more tricky !
The files apprear in green on the explorer (saw this already for GTRe, but there the track worked). Googled it and found that this means the files are encrypted. To take this away you need also to go to the file properties, under the advanced attributes, uncheck the 'Encrypt to secure data' and afterwards the files are not green anymore and rF sees them also in not admin mode.
So this is a Vitus issue (the archive is anyway a little bit odd).