The maps accepted by OziExplorer are raster ones being scanned images of paper maps. Automatic recognition of such images necessary to transform the data to vector presentation is rather complex task (like OCR and even more). Some so-called vectorizer tools are available in market, but most of them have very high prices while still require large amount of manual labour.
However, you may use raster maps in GPSMapEdit as base for manual drawing of vector ones over them, both and to fix existing vector maps
this thread moved to maps section