This is some kind of explanation from windows of that file:
"The file compression and decompression libraries take an existing file or files and produce a file or files that are compressed versions of the originals. The compression is also lossless, but the compression is not transparent to applications. An application can only operate on such files with the assistance of a file compression library. In addition, the only operations you can perform on such files are creating a compressed file from an original and recovering the original data from the decompressed version. Editing is typically not supported, and seeking is limited if supported at all.
Typically, an application calls functions in LzExpand.dll to decompress data that was compressed using Compress.exe. The functions can also process files without attempting to decompress them."
I don't know if this will help, but try this