Imagine, I have file with U3 extension and I have some command line tool, placed in c:nywhere ool.exe
If I want to use this EXE, all what is necessary is place CMD called U3.cmd into .\plugin\FileType folder. This plugin will contains 2 lines - one for load, second for save if %1 == -L "c:nywhere ool.exe" %2 %3 if %1 == -S "c:nywhere ool.exe" %2 %3 Important is that PSPad sends 3 parameters: -L/-S for load/save and 2 for file names (original file/temporary file) In the CMD file you can call your tool.exe with any other parameters what tool.exe needs. -- <https://forum.pspad.com/read.php?2,75934,75939> PSPad freeware editor https://www.pspad.com