There is only one file type that uses the .ULZ extension:
USBlyzer Data Capture File
Contains data captured by USBlyzer, a USB protocol analysis program; contains a hierarchy of connected USB devices with descriptive information about each device.
Information captured by a ULZ file includes IRP and URB structures data, transfer buffer contents, and device and driver object names. May also contain information about USB-related requests, I/O request packets, and incoming and outgoing USB traffic.
ULZ files can be exported by USBlyzer for future reference.
Updated: April 6, 2008