# isZip64

@Input
open fun isZip64(): Boolean(source)

Whether the zip can contain more than 65535 files and/or support files greater than 4GB in size.

The standard zip format has hard limits on file size and count. The Zip64 format extension practically removes these limits and is therefore required for building large zips.

However, not all Zip readers support the Zip64 extensions. Notably, the java.util.zip.ZipInputStream JDK class does not support Zip64 for versions earlier than Java 7. This means you should not enable this property if you are building JARs to be used with Java 6 and earlier runtimes.