1:
Does "Same problem..." mean that WAV file doesn't work in ProTools also?

Works perfectly (ProTools, Mixcraft, Sony etc.)
I used ProTools to record the guitar track.

2:
If you want to save Acid information, you should do this from the Render menu. You can even add Acid information to an existing WAV file.

Yes you can but it's pretty weird cause I just ask to save this simple WAV file ( remember the file is already WAV even before going to RealBand) and the whole software freezes and the only way youhave to leave is by pressing Ctrl+Alt+Del .