Posted by Andrew Carver on Jun 19, 2018; 6:50am
URL: https://discuss.asciidoctor.org/asciidoctor-fopub-on-Windows-10-tp6381p6401.html

I lied--there seems to be a fix. I'll try to do a pull request for this soon on asciidoctor-fopub...

(I was misreading the signs: all you have to do, it turns out, is save the parameter to a different variable, in a way that removes the quote marks, if any, that were surrounding the parameter:

set first=%~1

Then you just use that variable from then on, in place of %1.)