No idea :)
Since I'm working at the moment, I'm simply converting to OGG with an outside program and upload these with no issues.
I'm almost sure it won't help. I'm sure it's something to do with some XP/Win7 flag which was added in Ver.104.
It's not a big issue and I wonder if I'm the only one on the planet using XP.
Btw, is there any chance to see something like "Preload all sounds"?
This will save time to developer and most important - height of projects. If you're using 30 sounds, uploading a new one, removing the previous one from the preload line, and folding this long list of preload commands is very tedious task.
The "preload all sounds" will check which sounds are used in the project and preload them all.