In W7 and W8 I can execute an arbitrary executable from html just by registering handler in the registry as described https://msdn.microsoft.com/pl-pl/library/aa767914.aspx#app_reg
Similarly as mailto:someone@abc.com works.
The registration of handler in the registry does not suffice to get it to work in W10 though.
Have seen the https://stackoverflow.com/questions/24455311/uri-scheme-launching and https://msdn.microsoft.com/library/aa767916.aspx but still not no definitive answer. Anybody?
