When double click a BibTeX file in the file browser, then JabRef opens with message “File not found”.
The file opens only through the menu of Jabref: File–> Open…
I’m facing the same issue after upgrade “error opening file “abc.bib” file not found”
I confirm that happens after the last upgrade.
Seems like something with the file association is wrong.
Could you please open an issue at our bug tracker? https://github.com/JabRef/jabref/issues