fix(RVCMD): is_win issue

[simosechi]

Pull request checklist

• [x] The PR has a proper title. Use Semantic Commit Messages. (No more branch-name title please)
• [x] Make sure you are requesting the right branch: dev.
• [x] Make sure this is ready to be merged into the relevant branch. Please don't create a PR and let it hang for a few days.
• [x] Ensure all tests are passing.
• [x] Ensure linting is passing.

PR type

• Bug fix

Description

fix bug in issue #2009