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I missed your post Form july, but I don't know if the code for Plugins in dev builds and UiSim builds are identical.A nice and well done guide for compiling is https://www.rockbox.org/wiki/LinuxSimpleGuideToCompiling
The database is stored in pictureflow_album.idx (inside of the pictureflow folder). I seem to remember that the version generated by the simulator can't be used on the player, though, for one reason or another.
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