Also, there is at least one synth (Serum) where the developer declined to document the file format of the presets:

"I reached out to Steve through Xfer's forum and he was prompt and helpful. Unfortunately, the .fxp file format is completely dependent on the source code, and he can't release a spec for it without making the code open source. Which probably isn't happening any time soon."

https://www.reddit.com/r/edmproduction/comments/69hxa7/rever...