Title is self-explaining. Once I succeeded, and there was .inetloc file including xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
but now I cant recall how I did that. When you drag-and-drop email from a list in Mail.App there is an .eml file created, which is totally what I dont want.