[itsme]

I frequently use links to MSCZ files that I insert into PDFs with Sciurius' PDFLink script.
Here's an example that might be useful for testing.

For testing:
1.) install Musecore on Win10 or Musescore Songbook on Android
If it's correct double-clicking an MSCZ file on Win10 opens the file in Musescore. On Android the file is opened in Musescore Songbook. Sometimes there's an issue with Songbook so that it is necessary to do it a second time or open Songbook before.
2.) copy the files from the attachment into the same folder of an Android or Win10 device with MSP. Rename BlindMary.mscz.txt to BlindMary.mscz (the forum doesn't accept MSCZ files as attachment)
3.) import BlindMary_D.pdf into MSP
4.) Open BlindMary_D.pdf in MSP. Clicking the link icon in the PDF opens the MSCZ in Musescore / Musescore Songbook
5.) Add a Smart Button to the PDF that also refers to BlindMary.mscz. It will work on Win10, it will fail on Android