There is only one file type that uses the .UZIP extension:
FreeBSD Compressed Disk Image
Compressed disk image created by mkuzip, a FreeBSD compression utility; compresses a disk image, such as a .UFS file, so that it can be read during runtime by the FreeBSD geom_uzip utility; used to reduce the disk image file size at the expense of additional CPU time when reading the image.
UFS files are stored with a small script at the beginning of the image. This allows them to be run like any other shell script.
UZIP files may be seen with the multiple file extension .UFS.UZIP.
Updated: March 18, 2010