Unzipping in Mac C++

Hi again. I have a cross platform application, where i'm unzipping a zip folder.

in the folder i have a xxx.app. Inside xxx.app/contents/macos/ there is another file xxx, which has no extension. originally, it should be a linux executble. but after i unzip the file through my program using a opensource sdk, it extracts as a plain text file (because there is no extention) and the app cannot be run already!.

Do you know any way around this ?

I also tried extracting using 'unzip' in the terminal, and i get the same problem.. the only method that works is extracting with the "Archive Utility" but i need to be able to extract the folder programmatically in c++..

Perhaps the Zip format has bits to notify the extracting program what permissions need to be applied to each extracted file. You'll need to look into Zip structure. Admittedlly I would have then expected unzip to figure that out.

Maybe 'Archive Utility' is taking liberties by analyzing the extraction when it is a .app container folder. This would seem risky to me.

whether something is executable in linux is a matter of perms, not extensions (same thing in OS X to be honest)