The complete Windows Glk package, including developer information, can be downloaded from the IF Archive's Glk implementations page.
More information on Glk is available from the Glk web page:
https://www.eblong.com/zarf/glk/
Windows Glk also implements the Gargoyle Glk extensions for text formatting:
https://curiousdannii.github.io/if/gargoyle.html