Problem
User’s mapped drives do not show up as mapped in application Open/Save prompts, even though they show correctly in File Explorer > This PC.
Environment
This issue affects Windows 10 workstations joined to a domain where the user has one or more drives that are automatically mapped via Group Policy Object or NETLOGON script.
Cause
This problem occurs because UAC treats members of the Administrators group as standard users. Therefore, network shares that are mapped by logon scripts are shared with the standard user access token instead of with the full administrator access token.
Solution
Caution: Incorrect use of the Windows registry editor may prevent the operating system from functioning properly. Great care should be taken when making changes to a Windows registry. Registry modifications should only be carried-out by persons experienced in the use of the registry editor application. It is recommended that you follow best change management practices and always take a backup of the system registry prior to making modifications in the registry.
To configure the EnableLinkedConnections registry value, follow these steps:
Click Start, type regedit in the Start Search box, and then press ENTER.
Locate and then right-click the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
Point to New, and then click DWORD Value.
Type EnableLinkedConnections, and then press ENTER.
Right-click EnableLinkedConnections, and then click Modify.
In the Value data box, type 1, and then click OK.
Exit Registry Editor, and then restart the computer.
Additional Information
https://community.spiceworks.com/how_to/53670-mapped-network-drives-not-showing-in-an-application
https://channel9.msdn.com/Shows/Going+Deep/UAC-What-How-Why#c633305694960000000
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