Windows Mail is hidden in Windows 7 and is crippled so that the user application is invisible and cannot be used. What you are seeing is the database for Windows Mail in Windows 7, which is the same as that as for Vista (cf. www.oehelp.com/backup.aspx#wm). You won't find eml files there, as Windows Mail in Windows 7 is not used.
Windows Live Mail uses another database and eml files. If you want help with that, you need to ask here: www.windowslivehelp.com in the appropriate forum. This forum is not for Windows Live Mail issues.
steve