[Noiz2]

Well since nobody mentioned it SoundMiner, at least the version I have, will read and convert SD2 files.

As to the "it will open old sessions" part, it seems they were correct in that the sessions open, it's the sound file format that is a problem. ProTools had WAV as an option going pretty far back. I think it was PT4 that it showed up but maybe 5? Point is it's the files you need to convert the sessions seem to be opening.

Now this started as a convert SD2 to WAV need, but it looks like you are really looking for a way to convert the sound files AND the session file.

The best and most compatible way to do that is to open it in an older version of PT and "save copy in" (that menu option may have changed names in later versions of PT but that is what it's called at least through PT9. In the dialog that comes up you would choose to convert to WAV and use the latest session format.

If all you want is the file conversion then SoundMiner will let you batch the whole thing up, and you get a fantastic sound librarian in the bargain.

As long as the files are for PT sessions then keeping them as .L/.R is fine. But for most purposes it's not. SM will let you convert them to interleaved stereo at the same time it is converting to WAV.

Just adding a .WAV extension may work for some files and some applications but it is not a general solution. You really need to convert so the meta data that is in the recourse fork gets added to the file header. Just adding the extension should not work at all but obviously it does for some. If you do that I would open the file with whatever will open it and then save it so it has a proper WAV header. Otherwise those files are time bombs.