fix a stupid bug making audiogroup*.dat files undumpable when using it as...

fix a stupid bug making audiogroup*.dat files undumpable when using it as input file instead of data.win
2 jobs from master in 1 minute and 45 seconds
Status Job ID Name Coverage
  Test
passed #117286482
debug

00:00:56

 
  Deploy
passed #117286483
release

00:00:49