How to access Music folder in Windows Phone 8.1?
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Hi and welcome to devnet, I don't have a Windows Phone to verify but are you using QStandardPaths with MusicLocation for that ? 
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Hi and welcome to devnet, I don't have a Windows Phone to verify but are you using QStandardPaths with MusicLocation for that ? @SGaist yes, I have tried it as below: 
 QStringList musicPaths = QStandardPaths::standardLocations(QStandardPaths::MusicLocation);
 QMessageBox::information( 0, "info", musicPaths.first(), QMessageBox::Ok);
 but show empty path, I think QStandardPaths does not work on WP8.1 (audio too)
 I'm thinking about write one Windows Runtime Component in c++ and use with Qt, but I don't know how to deploy my dll along with Qt to target. I have import mydll.lib in .pro file but it still not work (dll was not found when run target).
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I have not used Qt on WinRT for a while but as far as I remember direct access (without using a file picker) will not work due to sandboxing. WinRT uses StorageFile objects (instead of FILE stuff known from C) and Qt caches these StorageFile handlers internally but only after using a picker. 
