Thanks for the info and for the link to the source code. That is the relevant information that I was looking for when I opened this thread.
I have found that this case is most likely a data corruption problem because I have found another .pcm file and have successfully decoded it by importing the RAW Data into Audacity with these settings:
Signed 16 bit
44100kHz
little-endian
mono
Here’s a screenshot of the settings for anyone needing this info in future:
I have attempted to import the .pcm in question with these settings but it again produces a flat-line instead of a waveform, and Audacity says the duration of the recording is 3hr 16m 8.012s. I tried importing the .wav file with the same settings and again, it is a flat-line instead of a waveform and the duration is 2hr 01m 20.640s.
It appears that I need to be looking for help with the recovery of corrupted data now, and I don’t think this is the right thread to be doing that.
I will consider the question answered because I was able to import a PCM file from the settings you gave, thanks for the help 