Thank you for the post.
1. Open Finder > Click “Go” > Choose Applications
The Applications folder contains no folder titled “FileMaker Pro 12”?
Afterwards, perform the following steps:
1. Quit all FileMaker applications.
2. Highlight a “.fmp12” database file > Right-click “Get Info” (or press Command-I).
3. Change “Open with:” to FileMaker Pro Advanced > Click “Change All…” (see screenshot below) and confirm the change.
Do the (.fmp12) database files now open with FileMaker Pro 13 Advanced?
Thanks for the fix! Worked beautifully—and so simple.