I agree. The first thing I do with tools like Excel and Word is to turn off autosave. A single accidental keypress can destroy hours of work.
When I did my e-file, I quit Turbotax found the file, did a "get info" and checked the "Lock" checkbox. An attempt to make changes and then quit caused TT to alert me to the file being locked. It then offered to either Unlock or to Revert. I chose Revert and quit. I looked at the file info and it had unlocked the file anyway! If I make a file read-only no program should be changing the mode of the file behind my back.
It seems there is no way to protect your files. I even used a command line to "chmod a-w taxfile..." and it modified it by saving it to a temporary file, deleting the original and renaming.
This all seems to be "Grandma rules". Lets make sure the file gets saved, whether the user wants it or not because we know better.
