Workdir command line parameter do not accept spaces in path

Trying to run the new Launcher .exe with the additional parameter --workdir works, but it won't accept spaces in the path. I even tried escaping the spaces in every possible way, the result is always the same.

Tried escaping the spaces with:

• Double quoting the full path
• Double quoting the folder inside the path
• Single quoting the full path
• Escaping each space in the folder path with a ^ character

Steps to reproduce:

1 - Open the command prompt (cmd.exe)

2 - Run the following command:

D:\XboxGames\Minecraft Launcher\Content>Minecraft.exe --workdir "D:\TestFolder - HDD\Minecraft\.minecraft"

Expected Behavior:

The launcher should create a ".minecraft" folder under "D:\TestFolder - HDD\Minecraft" and have its working directory as 

"D:\TestFolder - HDD\Minecraft\.minecraft" 

Current Behavior:

The launcher creates a "TestFolder" folder under "D:" and uses that as its working directory, ignoring the rest of the path specified into the command.