Running Win10 Pro x64 w/Windows WDK v10

When I run a command to create a .cat file using two .inf files, I get this:


C:\WINDOWS\system32>inf2cat /os:10_x86,10_x64 /driver:c:\Zoom
........................................
Signability test complete.

Errors:
None

Warnings:
None

Illegal characters in path.
Signability test failed.

I cannot for the life of me figure out how or why I have "illegal characters in path." The path exists as is: c:\Zoom

Google has NOT been my friend in this.

Is there a Powershell cmdlet that will do the same (which I could not find)?