idbeholdME: I think there is a way to escape the special characters somehow. I'm pretty sure I remember some people doing it, but I have no idea how it works on THIS forum :/
B1tF1ghter: Asking a blue may be worth a shot.
Tip in regards to urls:
GOG's CMS seems to cut everything before last https in a url (tested with webarchive links).
When there are special characters in URLs, you need to encode them, as in replace with %[hex], getting the hex value from
a table or charmap.
In case of archive links, one problem is the colon. But archive links work if you remove the protocol part.