Fp9 extension is associated with FileMaker Pro 9 database. You can open these files with FileMaker Pro 9 software.

These are the database files which created by FileMaker Pro software. Each version of this software uses their own extension. In this case, you can not open a current file with an old version. For example: Fp5 extension file is related to FileMaker Pro5 version. 
Similarly, .fp1, .fp2, .fp3, .fp4... files are also developed by this software. 

You can get detailed information from FileMakers official web page of filemaker.com

What to use fp9

FileMaker Pro 9

which page related to fp9 file


fp9 Related Searches

You can check related links about fp9 fileextension.