Possible fix for #15374

This should fix the Windows path bug with drive letters being detected as the protocol, getting modules to work on Windows properly.

I still need to actually test this out on a Windows machine (won't have access again till tomorrow) but I'm 99% sure it'll work out.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

Affected core subsystem(s)

esmodules