> file a-pptx-file a-pptx-file: Zip archive data, at least v1.0 to extract # 上面这里能识别成 pptx 而不是 zip 吗?
https://github.com/file/file/blob/master/magic/Magdir/msooxml
# .docx, .pptx, and .xlsx are XML plus other files inside a ZIP