Windows, may not require an ending quote mark, only an opening, in many cases.
So you can do something like,
DIR "c:\my documents
DIR "c:\my documents"
DIR "c:\my*
DIR "c:\my do*
DIR "c:\my documents
Doesn't work everywhere, & what a particular program requires may vary.
And kind of obvious, but for this to be of benefit, the directory (or file name) [with spaces] would need to be the final command line argument.