FileMaker Pro databases can be exported as PDF documents (the tables), so it should also be possible to do the same with individual snapshots (.fmpsl) , i.e. particular states of the databases. As far as we know, this can be only done using the original software.
Convert FileMaker Pro database snapshot file to Adobe Portable document format.
We found 2 software records in the database related to .fmpsl to .pdf file format conversion.
Microsoft Windows software - convert fmpsl to pdf on Windows
A program used to create and manage information databases
Convert from fmpsl file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned fmpsl to pdf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert fmpsl to pdf on OS X
A database management program for Mac