Are specifications of the FPL playlist format available? Why doesn foobar2000 use some user-editable XML-based playlist file format instead?
The FPL format is not meant to be interchangeable with other software or editable by users. Its primary design goals are carrying all necessary track information (metadata, last seen modification time, etc.) between foobar2000 sessions while remaining as fast to read and write as possible, since reading/writing FPL files bottlenecks app startup and shutdown with large Media Library or playlists. Making the FPL format user-editable would introduce massive startup/shutdown delays for certain users. Additionally, the format is strictly tied to foobar2000 track information caching architecture; potential design changes in that area in future foobar2000 versions will inevitably require a new non-backwards-compatible revision of the FPL format.
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