Unfortunately, your situation of not being able to access your compositions after #Finale shut down is a typical example of the downsides when you depend on #proprietary formats and #NonFreeSoftware as a #musician. :thinking_rms:
I had a hard time migrating from #GuitarPro to #TuxGuitar and I feel like I must move on to MuseScore, though its capabilities for tabs is limited (or different) in the way I am using it at the moment. However, you are can explore new methodologies in the process of learning a new tool. 🙃
And in my opinion you will always win when you choose #FreeSoftware and #OpenStandards for your projects. At least somebody is able to pick it up and proceed where you have stopped working or convert it into current formats. :hacker:
@thisven MuseScored opened the piano waltz .xml file just fine (and the piece sounds great); it crashes when asked to open the orchestral/choral piece. Will keep trying this afternoon.