* Caskey, Damon V. * Original date and author unknown, reworked 2026-06-01. * * Opens a PNG image from disk or the active pack file and records the * detected image type for later readimage() and closeimage() calls. * * If filename already includes .png, only that exact file is tested. * This avoids opening a valid image more than once and leaking pack * file handles. * * If filename has no suppor
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