FileOpen Systems provides a set of free plug-ins and viewers that can be used to access documents encrypted with the FileOpen software. These include plug-ins for Adobe Acrobat™ and Reader™, and standalone viewers for handheld platforms.
Prerequisites
Adobe Reader/Adobe Acrobat 9.0 or later (x86 or x64) needs to be installed first before you can deploy the FileOpen plug-in, otherwise the deployment will fail with an MSI 1603 error.