I withdrown all the files from the SD card then I got 4 files then I mirged them to be just in one file. I tried to unlock the protection of the files (which is NT protection ) what do they mean by NT protection?

I used the program ( fast image unlocker 1.90 ) and it shows that these files are protected in NT protection .. How to unlock this protection so I can edit the map myself. and when it is done (after editing ) how to send it ( the map ) again to any 276c ( for me or my friends' devices) ( I mean it will be a free edition aor a free map anyone can take it right away)