My friend records jams at 96kHz using Cakewalk Sonar on a PC, and the audio is saved as .w64 (Sony format). I offered to mix the tracks but my Mac's Logic Pro X DAW can't read the files.
There are converters online, but some are limited to 1GB whereas my files are as big as 7GB. I am reluctant to invest in an expensive converter only to find it either doesn't work, or I lose a lot of information in the conversion (after all a WAV file can't hold 7GB since it's limited to 4GB).
My friend wants to keep working at 96kHz and won't go back to provide smaller formats.