Can I use the 32-bit version of PKZIP/SecureZIP on a 64-bit version of Windows?
Yes you can, however, the convenience of PKZIP/SecureZIP integration with the default Windows command line shell will not be available. If you are using a 64-bit version of Windows, we recommend installing the 64-bit version of PKZIP/SecureZIP to make the most effective use of your Windows environment.