Editing & simulation
Why do G-code programs use so many different file extensions?
Updated
CIMCO EditNC files
Direct answer
Extensions such as .nc, .tap, .min, .eia, .mpf, and many others reflect control builders, CAM systems, and long-standing shop conventions rather than one universal G-code format. The extension helps applications find a file, but compatibility still depends on the actual control dialect and program content.
Practical checkpoint
Build the approved extension list from your machines and posts, then associate each type with the correct Editor configuration and machine group.