Is it possible to transfer data to Bento?
FileMaker 12 cannot open fileMaker 6 or earlier files. It can only convert .fp7 format files (versions 7 through 11) used this file format.
Do you still have an older system with FileMaker 6 installed? If so, you can use it to open the file and export the data as a text file. I don't have Bento, but if it can import data, I would expect it to be able to import from tab or csv delimitted text files--both options for exporting data from FileMaker 6.