Definition files come in two forms: “how does this get written to what areas of the chip in the car”, and “how do I edit the timing and fueling and etc valid inside the tune”.
Ecuflash files are generally the former. OFT doesn’t have a “file” for the former, as it’s builtin to the tablet somewhere.
Romraider files are the latter. OFT’s XML is also the latter, for people who want to open their tune in RomRaider and change values in it and then reflash it to the vehicle.
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