Both BYOND and Brain had written workarounds for the problem. Byond said there were shell execution registry entries that needed adjustments or the surrounding quotes would be sent as part of the URL. Maybe starting fresh as you did removed such keys and they were set to the proper values the current behavior MS expects? Seems they needed to remove “–single-argument” from some key(s) affecting Computer\HKEY_CLASSES_ROOT shell entries for Chrome? Someone affected could research a bit about it and bring us details.