.ENG is a binary format specific to Jingdiao controllers. If you want to run JDPaint 5.50 toolpaths on a non-Jingdiao machine (like Mach3 or LinuxCNC), you need a converter or a post-processor that outputs standard G-code (usually with a .NC or .TAP extension).
This is where JDPaint 5.50 shines. It turns flat vectors into machine code: jdpaint 5.50

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