Trouble Installing Musepack on LMS 7.8 on QNAP NAS

Hi,

I am running LMS 7.8 on a QNAP NAS.

In the LMS Settings under File formats, all Musepack options are grayed out.

So I downloaded for SV7 from Musepack as suggested in thread 40351 here.
I took the files MPPDEC and MPPDEC-Static.

I copied them via SFTP to
/share/HDA_DATA/.qpkg/LogitechMediaServer/lib
and
/share/HDA_DATA/.qpkg/LogitechMediaServer/bin

Restarted the entire NAS. No progress.

Renamed MPPDEC-static to MPPDEC, restarted again. No progress. Musepack is still grayed out.

Am I missing any steps? Configuration files?

Any hints are highly appreciated

Martin