MExplore is a Pocket-PC Directory Explorer and Backup program.
Small program that acts as a File Explorer, and optionally as a backup up utility.
The program was made in Visual Basic but the backup portion of it, uses an external DLL.
When pressing Gzip it takes the selected files in the source directory and compresses them in a single gzip file in the destination directory. Note that it doesn't recurse. Only files are processed, not sub-directories. Also note that the .gz file contests are not compatible with other utilites. Selecting a .gz file in the source directory and pressing UnGzip will extract it's contents to the destination directory.
If you click on the Source Dir or Destination Dir buttons you get a listing of contents. The rest is easy to figure out.
I must note that the SapphireGZip.dll is not mine, and you can download a free version from here: http://www.sapphire-solutions.co.uk/gzip.htm.
The Sapphire.DLL (for your CPU) should be copied in your Pocket PCs' windows directory.