Previously, a device mapping had been established using HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSession ManagerDOS Devices to add an alias from D: to C:Build. This approach discussed in the wikipedia SUBST article and similar.
After updating to Windows 21H1 this registry setting was removed1, and even after re-adding the setting, the “D:” device is not being enumerate in Explorer, powershell, or bash-git (mingw).
After the installation the “DOS Devices” registry section has been updated1 to add a the registry key shown below. However, this does not seem to take effect. How can I restore this ‘permanent subst’ functionality to a directory target?
Name Value
D: \??C:Build
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1 https://www.satsignal.eu/software/Win-10-notes.html notes that the “DOS Devices” are deleted and have to be manually added back (in Windows 10 build 2004). It makes no mention of this functionality being removed. I have re-added the DOS Devices entry back and the mapped drive is still not appearing.
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Using WinObj (from Winternals) shows the correct Name and Symbolic Link Target in
GLOBAL??for “D:”. -
The “C:Build” directory exists with standard permissions (eg. SYSTEM full control, Authenticated Users all-but full control, Users with read access).
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This was an in-place update of Windows 10; pre-20H2.
