Enable Legacy Client Drive Mapping Format on XenApp

Objective
With XenApp 6.x and later, Citrix changed the format on how to display mapped client drives. In earlier releases, drives where mapped to a physical letter. With this release, a redirection similar to Terminal Services is implemented, that displays the drive as a local disk and the source device it is mapped from. Client drives therefore appear as “Local Disk” as in the following screen shot:

There are instances that require an administrator to enable legacy client drive mapping in XenApp so that unique drive letters are used to map client drives:

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Instructions
To enable legacy client drive mapping on XenApp, the following registry key must be set on the server:

Caution! Refer to the Disclaimer at the end of this article before using Registry Editor.

Create this registry key if it does not exist:
HKEY_LOCAL_MACHINE\Software\Citrix\UncLinks\

Under the key, create a DWORD: UNCEnabled.

Set the value of UNCEnabled to “0”.

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Additional Resources
CTX126763 – Client Drive is Not Mapped Using ICA Client Version 12 as Pass-Through Client
Disclaimer
Caution! Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.
Applicable Products
XenApp 6.5 for Windows Server 2008 R2
XenApp 6.0 for Windows Server 2008 R2
XenApp 7.5
XenApp 7.6