G-files

A zip file is like a compressed sub-folder that can contain any kind of file. It is not a file in and of itself. By itself, it is just an empty directory.

What you are probably really asking is: can the files in the zip file be converted to g-codes? The answer is: maybe yes. In your case the ZIP file contains STL files that can probably be used to create g-codes.

If the files are CAD (Computer Aided Design) files that contain 2D or 3D geometric information in a format that can be processed and then output into g-codes then read on…

It takes additional CAM (Computer Aided Machining) software to create the g-codes. The CAM software reads the CAD file. You then select tooling to be used to follow CAD geometry. You choose offsets, speeds, feeds, etc. You must also select what kind of CNC (Computer Numerically Controlled) machine the g-code is for. Then when all input variables are satisfied, the CAM software will attempt to process the data and generate the G-codes.

The process we are most familiar with these days is 3D printing. We start with a STL (Stereo Lithography) file that contains the 3D CAD geometry. We open it in a CAM software like Cura. Select what 3D printer we are using. Then set the feed rates, layer heights, temperatures etc. Finally we command it to Slice the model and write the g-code to a file or directly send it to the printer.

If all goes well, we started with a CAD file and produced g-code that could be run on a specific machine to make a physical part.

Unfortunately there is no generic process that can take any CAD file and automatically produce generic g-code that can be run on any CNC machine. It takes a lot of operator input and knowledge of the target CNC machine.