These samples are mono channel headerless XMA streams.
You'll need to use
QuickBMS from Aluigi and
AlphaTwentyThree's XMA Transform Script to add a proper XMA header.
From the samples you provided, they are definitely mono from the XMA flag identifier near the start of the file (FC 03 80 00) found at 0x06 so you might need to adjust two lines in the script and change it around for other audio files as well as needed.
set FREQ_DEFAULT 48000 # for files without given freq info/headerless files (replace 48000 with one of the following: 22050, 32000, 44100 or 48000)
set CH_DEFAULT 2 # for headerless XMA files (2 for stereo files, 1 for mono files)
Stereo files have the XMA flag identifier (FC 01 C0 01) which can also found at 0x06.
After you have added a proper header,
ToWAV will decode them from XMA to WAV.