I can't find any information in the release notes concerning fixes ...
- OS X: Addressed an issue where each time FileMaker Pro 13.0v4 or FileMaker Pro 13.0v4 Advanced was opened, a system message asking whether to allow FileMaker Pro to accept incoming network connections appeared.
- OS X: Addressed an issue where the VoiceOver onscreen-reader software failed to read field contents.
- OS X: Addressed an issue where selected fields were not visible in the Specify Field dialog box without the user scrolling to them.
- OS X Lion 10.7: Addressed an issue where FileMaker Pro 13.0v4 or FileMaker Pro 13.0v4 Advanced failed to open.
Looks like they have forgotten to add the section for MS Windows. I have reported back (using the Was this answer helpful? No button). You can do that, too.
Also mentioned elsewhere that there is a Windows updater with no information at all about what it does :-(