File archive compressed with lzop, a compression utility based on the LZO (Lempel-Ziv-Oberhume) data compression library; similar to the. An LZO compressed file is integrated with file archiving specifications that can reduce the size of all files stored in the compressed file, and the LZO format is the. lzop is a free software file compression tool which implements the LZO algorithm and is licensed under the GPL. What is an LZO file? The LZO file type is primarily associated with lzop. Literally what I did to figure this out: $ apropos lzo IO::Uncompress:: AnyUncompress (3perl) - Uncompress gzip, zip, bzip2 or lzop file/buffer.