I am using a Mac.
The originator is sending me soundfiles in RAR format via MediaFire. I download them and then decompress them into FLAC files using the freeware app Unarchiver.
When I play back I get gaps in the sound and crackly noise intereference. There is no patttern to this.It has happened with files sent previously.The originator says he hasn’t had the problem reported by anyone else.