Yes you can open them in Audacity, Import> Raw Audio>16 Bit/2 Channel/Little Endian/Skip First 8 Bytes. Use the Normalize effect, -12dB is a good starting point but you'll need to try it out to find a good level. Then save as 16 bit PCM WAV, and then run it through WAV2PCM (I'm on my phone and don't have a link, sorry). Finally, you need to copy the 8-byte header from the original file into the new one using a hex editor (really it's just bytes 4-7, but either way, you want to paste OVER the existing 8 bytes, not insert). Sorry if that's hard to follow, like I said I'm on my phone right now.