IPA: //ʌn.kənˈvɜːr.tɪd//
KK: /ʌnˈkɒnvɜːrtɪd/
Describing something that has not been changed or transformed from its original state.
The unconverted files were still in their original format and needed to be updated.
Unconverted → It is formed from "un-" (meaning not) and "converted" (from Latin "convertere", meaning to turn around or change). The word "unconverted" means not changed or not turned from one state to another.
Think of 'not' ('un-') having changed or 'turned around' ('convertere') — that's why unconverted means something that has not been changed.