REGEDIT4

[HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/x-qtview]
"CLSID"="{31A689A4-124B-11D1-B933-444553540000}"
"Extension"=".qx"

[HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/qtview]
"CLSID"="{31A689A4-124B-11D1-B933-444553540000}"
"Extension"=".qx"