Is your feature request related to a problem? Please describe.
Yes, the bash code block language (shell) does not exist on Windows. It may exist via GitBash, but slides does not pick that up, but I'm not requesting. Exit code 127 appears for these.

Describe the solution you'd like
It would be great to support CMD or PowerShell, or just use bash, but call one of those executors.

Describe alternatives you've considered
There is none for CTRL-E on Windows and executing shell content.