How to use a path with spaces in the batch file? [duplicate]

The issue is that the start command (built into CMD) has a special way to handle the first parameter with quotation marks, which is to specify an optional title for the created window; without the first set of quotation marks (like the solution below), the start command is interpreting the command shown in the question as follows:

1. Create a window with a title of:

   C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC
   

2. No information is provided on what to actually start in that window

The solution is to run:

start "" "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC"

:: # Or more elaborately:
start "Optional Window Title" "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC"