So, you’ve spent a lot of effort adding ratings to the media files in your media library in Windows Media Player. You later decide to move all your content to another workstation/server and realize that all the ratings are lost in the transition.
WMP Ratings are stored in a database stashed away in your Windows profile. Simply moving the media files to another machine is not enough to migrate the ratings. The database is a binary file and contains links to the physical location of media files. Thus, copying the database over to a new machine will not suffice.
Fortunately there is now a way to transition your ratings, using the Ratings Migration Powertoy. This handy tool installs as a plug-in into WMP9/10 and will copy the ratings from your profile to the physical WMA/MP3 files. Once migrated, the rating information can be extracted from the files and added to a new database in your profile.