I was replacing the arrow with my car. and I needed to put something else onto my sd card so I took it out while in testmode, replaced the edited data.zip file as instructed, and when i rebooted, i get an error message someting about program application cannot be started. It quickly goes to the main menu and says startup in progress. and just reboots to splash and back to that startup in progress screen over and over. Did removing my sd mess up my system or the data.zip is corrupt

the data.zip you edited is corrupt. put your backup copy of the original data.zip file back.

yup that fixed the problem thanks. i don't see how it could be corrupt though. Since I have Diaftia's mods installed, I took that data.zip, unzipped it, replaced daycar and nightcar with my own car bmp files and rezipped it using winrar. Could it be that my pictures are not in the right format or resolution?