I've come up with a workaround. Go into the properties of the Minecraft shortcut and change the target to add the "--workDir" argument (without quotes) and add the full path to the .minecraft directory using the actual drive letter, not the junction to C: For example: If the .minecraft folder is located in the default location in the Users folder, and if the Users folder was moved to the D: drive, change the shortcut target to: "C:\Program Files (x86)\Minecraft\MinecraftLauncher.exe" --workDir D:\Users*****\AppData\Roaming\.minecraft Substitute the asterisks with your user folder name and the launcher should open properly despite the junction. If your .minecraft folder is on another drive or folder, just change the path to match your installation. Then go into the launcher and change the launch options to use the same full path and drive letter the .minecraft folder is located in.
Same issue, I've had to move my Minecraft saves to a folder on my root C:/ drive. I use an mklink junction to my user profile and cannot keep my saves in the %appdata&/.minecraft folder anymore.
I've come up with a workaround. Go into the properties of the Minecraft shortcut and change the target to add the "--workDir" argument (without quotes) and add the full path to the .minecraft directory using the actual drive letter, not the junction to C:
For example: If the .minecraft folder is located in the default location in the Users folder, and if the Users folder was moved to the D: drive, change the shortcut target to: "C:\Program Files (x86)\Minecraft\MinecraftLauncher.exe" --workDir D:\Users*****\AppData\Roaming\.minecraft
Substitute the asterisks with your user folder name and the launcher should open properly despite the junction. If your .minecraft folder is on another drive or folder, just change the path to match your installation.
Then go into the launcher and change the launch options to use the same full path and drive letter the .minecraft folder is located in.