Jacek Caban (@jacek) commented about dlls/mshtml/mshtml.inf:
HKCR,"MIME\Database\Content Type\text/plain","CLSID",,"%CLSID_HTMLDocument%" HKCR,"MIME\Database\Content Type\text/plain","Extension",,".txt" HKCR,"MIME\Database\Content Type\text/plain","Encoding",1,07,00,00,00 +HKCR,".log",,,"txtfile" +HKCR,".log","Content Type",,"text/plain"
Where does it come from? On Windows 10, I can see only the default value ("txtfile"), but not "Content Type". On Windows 11, there is "OpenWithProgids" subkey, but no other values.
Also please use more canonical commit message. "mshtml:" is enough for the prefix, uppercase "Add...", see git log for examples.