npx not working on Windows for not installed packages

[katemihalikova]

When trying to run an executable of a package that is not currently installed, npx fails to run underlying npm commands.

♥ npx ncp --help
Command failed: C:\Program Files\nodejs\npm.CMD config get cache
'C:\Program' is not recognized as an internal or external command,
operable program or batch file.

Any package that is currently not installed globally or in local scope ends with the same error.

• node -v: v6.9.4
• npm -v: 5.0.1
• npx -v: 2.1.0