The fun part is that these Office files are just .zip files in disguise.

Lets use an example.

The un-zipped file contains a few XML files with the text and other file information.

iPhone 16e with iPhone 16 Plus and iPhone 16 Pro in hand against grey wall.

However, the original file ending and some other metadata is still present.

An Excel table with a named range.

Screenshot of a PowerPoint with embedded images.