Ok hmm... Is there any other form of file/folder encryption that is much simpler than .zip then? This would be handling around 5mb file. And there would be folders and subfolders not just a single file here.

Really the objective for me, Is not to achieve a small compression, but merely to have the files and folders packaged into one single file, like a .zip, which I could extract with pure mIRC script.

Every time I type 'simple file compression' in google I get zip.

Edit: There is another criteria... The file packaging format must be reasonably popular, So that a user can package their files with a common windows or linux tool, and not with a mIRC script. So this rules out something like the 'vpak' script by variant. So we have compression with a 3rd party program, Decompression with pure mIRC script... But it's really about folder packaging not compression, I don't care if the end resulting file is a bit bigger than the original folder.