diff --git a/extras/package/win32/NSIS/helpers/extensions.nsh b/extras/package/win32/NSIS/helpers/extensions.nsh
index a62ec0615a..269bd0a5de 100644
--- a/extras/package/win32/NSIS/helpers/extensions.nsh
+++ b/extras/package/win32/NSIS/helpers/extensions.nsh
@@ -190,6 +190,7 @@ FunctionEnd
   !insertmacro ${_action} Video ".asf"
   !insertmacro ${_action} Video ".avi"
   !insertmacro ${_action} Video ".bik"
+  !insertmacro ${_action} Video ".dav"
   !insertmacro ${_action} Video ".divx"
   !insertmacro ${_action} Video ".drc"
   !insertmacro ${_action} Video ".dv"