.fp7 files will open in any version of FileMaker from 7 through 11. After that, they need to be converted to the .fmp12 format.
Thanks! Have any of those versions (FM 7-11) been certified for El Capitan...
I like the simplicity/interface of v7 for what i do and don't want to go any newer
of a version than absolutely necessary. Would consider reverting from El
Capitan to Mtn Lion if that''d allow for keeping FM 7 as-is.
Just as an aside, you're asking for trouble staying with deprecated software. There are security and compatibility consequences of not moving forward.