[LAU] Need help salvaging a recording

Hello guys. I'm in need of help right now. Last night I recorded a show using qtractor. I recorded it as two files, the first one is for the first hour, and second file is for the rest, about 4 hours. The first file can be played successfully, but the second file does not. It would only play until about 20 minutes, and stop. This is the output of soxi shani@shanihplaptop ~/Projects/GME/2010 % soxi 6.wav soxi WARN wav: wave header missing FmtExt chunk Input File : '6.wav' Channels : 2 Sample Rate : 48000 Precision : 24-bit Duration : 00:20:50.04 = 60001717 samples ~ 93752.7 CDDA sectors File Size : 4.77G Bit Rate : 30.6M Sample Encoding: 32-bit Floating Point PCM The first file is only about 1GB, but the duration is about one hour. I wasn't able to verify the recordings last night, but I remember that when it's being recorded the waveforms are shown on the screen just fine. When the show ended, I stopped the recording, pressed Save, and shutdown the computer. I was in a hurry, so I forgot to close qtractor first. Does it have anything to do with the error.? Is there any way to salvage the recording? Might it be that part of the file is corrupt but the rest isn't? Thank you