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I am trying to recover PLT files from a flash drive. Using photoRec 6.14 which says it supports this file type.
Am able to recover jpg, png, psd files by not PLT. Gerber Graphix Advantage 6.2 version

Does anyone know why this file type is not found. I know they are on the disk.

Check if plt is listed in FileOpts. You may use an older 6.14-WIP.
Otherwise please send me a PLT file generated by the same version you are using, I will check with it isn't recovered by current 6.14-WIP.