This is very similar to the situation I ran into with the file that we fixed with Visual Studio, which is why I was suggesting the hex reader as a possible solution. I had a file that was about three minutes of soundcheck before I paused my unit, then about an hour of a live set. Something glitched, and the first three minutes played back fine, then the set was all white noise. After we ran the file through Visual Studio and plucked out a couple of zero-sets, the first result was to turn the first three minutes into white noise, and the last hour became music again. It was a pretty easy process to put everything together properly at that point.
On a Mac, you can look at the data in a file by right-clicking on the file, and then choosing the "Open With" option, and using a clean text editor, like BBE Edit or Text Wrangler, for example - basically, the idea is to open the audio file as though it were text instead of audio. I'm afraid the only hex reader I know for the PC platform is Visual Studio, but there may be others. As soon as the file opens, then it will become pretty clear what I'm talking about. I know that there are some files which you can't see yet, but I was thinking that if you could open one of the files that you CAN see - from within the program itself - that you could then try directing the program to the directory where all the files are supposed to be, and at least see if the other files are visible. If they are, and they're not grayed out, you could have a chance at opening them, and tweaking a couple of zero-sets as we did.
If it sounds like white noise the bytes are not aligned correctly into frames. 24-bit stereo audio has 6 bytes per frame. (2 channels in each frame times 3 bytes each). If the alignment is incorrect then you can hear total white noise, or white noise and some very low level audio.
The solution to this is to import as a raw file into a DAW, but you need something that will start reading the data at a certain offset instead of at the first byte. (ie. of the data chunk)
I use Samplitude for this but some have done this repair with Audacity and also I believe that Adobe Audition can do this.