@ kidjedi
Without knowing what settings you were using to filter your duplicates, its hard to know what went wrong. As you can see from the image i posted, MB is showing 2 versions of Sweet Dreams, but they are not really duplicates. If you could hover over the path you would see that one is a live version and the other is the original album version. These are only showing as I deliberately only used title to search for duplicates.
As for your original files before being converted to ASX, I think that MB does permanently delete them. Check one of those ASX files, and you may just have to edit the path to the kept file.
Since I was just testing the Duplicate Manager's abilities, I just left the settings it defaulted to selected (title and artist), but I thought I was "being safe" and just dipping my toe in the water by only asking MusicBee to alter three files... luckily MusicBee seems to have choked on the number of duplicates (even though they were
not marked for deletion) and crashed after the first 2,000 files.
Not only that, but MusicBee deleted ALL files for every song and NO file was left to which the new ASX reference was pointing. To reiterate, this means the ASX files do no good (they are pointing to nothing). This is a significant problem that really needs to be checked at the code level.
It would be great if there was an option to have MB Duplicate Manager place files marked for deletion in a repository folder (a safety) instead of just deleting them. You can theoretically recover from the recycle bin if your files are on a hard drive physically attached to the computer you are using, but for those people using NAS (a media server), deletions are permanent. And I would think at this point in time there would be quite a few people using networked drives.
I suppose it is possible that the ASX files point to nothing because MusicBee crashed before the process was completed, but this means that actual music files are deleted before the ASX files have anywhere to point, and this process order should be rectified in the code.
I could see someone (someone who doesn't back up their media library), permanently losing a LOT of music files as a result of this.