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i don't know what .ptb is. Please explain how to open this (sorry if you've already explained it) !
thanks for all of this!
Its a Powertab file.
Powertab is an oldish tab editor but version 2 still works ok on my Windows 10 laptop:
TuxGuitar software also opens .ptb files, still a current software.
Or you can use Soundslice to view the ptb file.