These are MW / SW / FM recordings wit large bandwidth for the Perseus SDR receiver. You need Perseus receiver software or SDR sharpp (SDR#) software to play the files. They will not work with audio players like VLC, Winamp etc.
Handewitt (North Germany) my own uploads (FM, OIRT and MW), Boston 1986 & 1991 and some more (these appeared in a forum some years ago)