Hello World for WBFM Wav-file source?

[Robert Heerekop]

As a rookie roller coasting in steep learning curve...
I recorded several WAV-formats radio FM spectrum with SDRsharp and RTL but fail to WBFM play them in GNR.
I try to learn and already did read wikis and watched helpful videos, but failed...
Can anyone guide this rookie and get me on track again with a WBFM Wav-file hello world?

My failing attempts summarized:

All files: https://tinyurl.com/WBfmWAVfileHelloWorldRequest

Thanks in advance and it might also be interesting for others.

Robert