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DRM Ringtones no longer work

I purchased 4 ".dcf" ringtones from VW and they have been working until a couple of days ago.  They are on my phone (not SD card) but suddenly no longer work and are no longer seen on the settings>sound>phone ringtone list.  When I go to one of these files and tap it,I get a message "unable to open this type of file.".  Anyone have any idea on how to fix this issue?