Are you trying to you lost, or are you looking to reskin an existing vanilla item ? DayZ-RF/DayZ-Modding-Features: Converter from ... - GitHub
If you have an old mod where the original source files (MLODs) were lost, debinarizing the .p3d is the only way to recover the work. p3d debinarizer dayz upd
Set your path in the .bat file and run the script to produce unbinarized versions. Are you trying to you lost, or are