FileInfo.com - The File Extensions Resource

.FP File Extension

File Type	FileMaker Pro Spreadsheet
File Format	File
Common?	No
File Description	Spreadsheet file created by FileMaker Pro; organizes data into rows and columns and is saved in a proprietary FileMaker format; used along with FileMaker database (.FMP) files.
Program(s) that open fp files	Mac / Windows: FileMaker Pro

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/fp