the author of this app says:
Zip Manager is powerful, intuitive and innovative zip utility designed to compress/decompress any type of files . This results in saving memory and increases the overall storage capacity of Pocket PC. It also saves connection time by sending compressed attachments via e-mail and IR.
Files can be decompressed from outside the application by just clicking the compressed file icon which is available in the folder.Click the compressed file icon to extract it automatically. We assure, You will never come across insufficient memory problem in future.
Windows Mobile and PocketPC. Download redirects to developer merchant page.