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If the ZIP file only holds that one TXT file, then I'm afraid chances of recovery are low. Try visually inspecting the file's hex dump. A "true", undamaged ZIP file should contain high-entropy, random values (all the more so if it's encrypted too). If there are large swaths of repeated filler characters (0x00, 0xC0, 0xA9, 0xFF...), then that section of file ...


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