Here is a small notification for the people not following the GitHub commit log (which are probably most users of FSO

).
The JSON pilot feature has just been merged which converts the previous
.plr files from a custom binary format to the standardized JSON format. At the moment, only the main pilot files are stored as JSON but at some point the campaign files will also be converted to JSON.
FSO will automatically convert the binary pilots to JSON on your first launch and will then only use the JSON pilots. That means that the "old" pilots will not be updated anymore so if you switch to an older build you will not see the changes that were made to the pilot with a build which uses JSON pilots.
That is all, have a nice day.