# .NET DLL Installation

During installation, several DLL files are installed in the global assembly cache:

    TIBCO.EMS.DLL
    TIBCO.EMS.ADMIN.DLL
    TIBCO.EMS.UFO.DLL

If an earlier release of TIBCO Enterprise Message Service is installed on the computer, the new EMS 8.5 DLLs replace those of the earlier version.

To reinstall the previous EMS release DLLs, you must first uninstall the new 8.5 DLLs, then reinstall the DLLs from the previous release. Both of these tasks can be accomplished using the Global Assembly Cache Tool (`Gacutil.exe`) provided by Microsoft. DLL files are located in the bin directory of the EMS installation.

Additionally, the following policy files can optionally be installed in the global cache:

    policy.1.0.TIBCO.EMS.UFO.dll
    policy.1.0.TIBCO.EMS.dll
    policy.1.0.TIBCO.EMS.ADMIN.dll

When installed, these policy files facilitate upgrades by automatically redirecting existing EMS applications from an older assembly to the newest assembly.

For more information, see the section on Assembly Versioning in the TIBCO Enterprise Message Service User’s Guide.

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