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Has the Track Numbering System changed since 2012

I'm trying to find my pacenote from 2012 but the track numbering system seems to be different. Can anyone confirm this for me.
In RSRBR? I very much doubt it. No radical changes anyway.

Could you be more specific about what you think has changed?
Well, I'd say that all the original stage IDs have surely remained intact all these years and ID 22 happens to be for Chirdonhead.

So why exactly you don't have that dls file in your 2012 maps folder is a separate matter. Could it be that you've used BackupRSRBR.exe to backup the dls files too and it has failed to do it for that file?