Maverick Help

Hi folks,

I've read through all the other Maverick help threads and haven't found any solutions. I used Atlas Creator to download maps for offline storage on my SD card and that went fine, but Maverick doesn't recognise the files, even though the files are definitely set for Maverick. Personally I suspect it's because Maverick downloads its own files as .png.file and Atlas Creator downloaded them all as .jpg.file - if this were indeed the problem, are there any free programs out there for mass conversion?