If the file is missing from the directory, the database entry is useless. As mentioned, this is the main issue with these "43,000 driver" versions—the index claims the driver exists, but the file is gone.
Since you can't find the specific
SK12FD99.drt, try searching by the
ECU Software Number instead of the driver name.
- Open the software and load your original file.
- Look at the ECU Info (HW and SW numbers).
- Search the driver list manually for that specific SW number.
Sometimes a driver exists for the same ECU SW but under a different car model or chassis. If you find one with the matching SW number, load it, but
check the 2D view carefully. If the maps line up (injection, spark, turbo, etc.), you can use that driver even if the filename is different.
If that doesn't work, you will have to define the maps manually or use WinOLS.