## Zip64Mode enumeration Specifies when to use ZIP64 format extensions for OOXML files. OOXML file is a ZIP-Archive that has a 4 GB (2^32 bytes) limit on uncompressed size of a file, compressed siz...... OOXML file is a ZIP-archive that has a 4 GB (2^32 bytes)...file, and total size of the archive, as well as a limit of 65,535...