if i remember right there were questions about this (or was it going the other way around... i dont know)
you can open files and click some option to 'ignore version' or edit the .ma save file so it's the version you're using
that's a "Ch" pronounced as a "K"
Computer skills I should have:
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D