Opening files

Specifically, the Adobe Reader Mobile product can only open PDF files (i.e., files with the .pdf suffix and valid PDF format). A zip file is a a container file format containing one or more compressed files of varying types, possibly including PDF files). As @Bernd Alheit advised, you need an application that opens a zip file and either directly invokes the application associated for each file within the zip file or places the file in the device's file system for you to subsequently open in the application supporting the files' types.