Run windows command

(Moved the question here from StackOverflow)

I am not familiar with windows. Please help with the following questions.

1. The windows program is "xxx.exe". When running it, we can do "xxx -options" instead of "xxx.exe -options". Is it true for all windows command that "xxx" and "xxx.exe" both work? If so, I can do "xxx -options" across platforms as linux and mac have "xxx" instead of "xxx.exe".

2. If I run the command with the absolute path and the path contains spaces, I understand that the path needs to be surrounded by quotation marks in windows. Is it right?

Thanks!