How to design a vector graphic so that EZCAD will recognize it as a double-line icon that can be filled?

in FAQs about Laser Marking, CDR, EzCad, Graphic Filling

In actual use, AI icon files opened in EZCAD become single-line files that cannot be filled. How can I solve this problem?

The CDR x7 has a function that can solve it with one click, object – enable contour. It allows you to quickly convert a single line into a double line.

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