Enabling Linked Connections
On Windows Vista (and possibly higher versions of Windows), it may not be able to write to a mapped network drive immediately after a reboot using QUARC blocks, like the To Host File block. Only after the network drive is accessed in Windows Explorer will it be able to access the file. The problem is due to a known issue in Windows Vista when User Account Control (UAC) is enabled that arises because network shares that are mapped are shared with the standard user access token instead of with the full administrator access token.
The issue can be resolved by changing the EnableLinkedConnections registry value. Extreme caution must be exercised when changing the registry, because any mistakes can cause Windows to malfunction. To modify the EnableLinkedConnections registry value, perform the following steps.
Click Start and type "regedit" (without the quotes) in the Start Search box. Then press Enter.
Locate the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
registry key and right-click on it.
Select from the context menu.
Type "EnableLinkedConnections" (without the quotes) and then press Enter.
Right-click on the "EnableLinkedConnections" value that was created and select from the context menu.
In the Value field of the dialog that appears enter the value "1" (without the quotes) and then click .
Exit Registry Editor and then restart the computer.
After performing the above steps, the problem should be resolved. For more information on this issue, please refer to the Microsoft Support page: After you turn on User Account Control in Windows Vista, programs may be unable to access some network locations.
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