themaster -7 Newbie Poster

I have a .iso disk image file which was created by cosmos OS during the build(please ignore if you don't know what cosmos is).

A disk image was created and there were some files on it.
Their names were:-
ISOLINUX.bin
OUTPUT.bin
BOOT.CAT
ISOLINUX.CFG
MBOOT.C32

I want to replace OUTPUT.BIN with another binary file.
But when I try it, an error message comes that the files are read-only.
When I try to change their attributes an error message comes that access is denied.
Is there a way solve this problem and replace the output.bin with one of my other files.

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