When installed by the installer, we add registry entries to configure
directory context entries in explorer.exe that enable "Open WezTerm
here" to function.
This works by running your default program with the current working
directory set to the one specified.
I plan to only enable this when installed by the installer so that
these can be deleted/updated by the installer later on.
If you want wezterm to run a different program by default, then
you can change the default_prog config in the wezterm configuration;
I don't plan on adding lot of context menu entries for this.
Note that attempting to open in the `C:\` root doesn't always seem
to work for me. I haven't had a chance to understand what's going
on there.
refs: https://github.com/wez/wezterm/issues/155