I have watched tutorials and did some research on exporting to exe , but no assets are protected. instead, there hidden in a file like NW and .ZIP and those can be opened. any way this can be prevented?
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nope, neither scirra nor NWjs do anything to protect your assets - Like you said it's just dumb zip file that can be open by anyone with two mouse clicks. Instead they will just keep telling you that if someone want your files they will eventually get it.