APRS Files are DOS/Windows 3.xx version. Unzip with Pkunzip -d to C:\APRS directory to properly create subdirectories. CA.ZIP contains updated detailed California maps and should be unzipped into the C:\APRS\MAPS directory. MAPLISTS.ZIP may contain updated map lists which are necessary to find the California maps. Be sure to substitute MAPLIST.USA for the same file automatically created in the C:\APRS/MAPLISTS directory.