I'm having some trouble modifying my data zip file. I click on the zip file and browse to navigatemap 800 480. I then edit this file but when I try to save I get an error message telling me I can't save it to the same location.

I must be doing something wrong any help is appreciated.

Thanks.

Use WinRAR or 7ZIP instead. WinZIP can be used but you need to do a raindance around it and sacrifice some chickens...