The Bat! 4.2.10.4 (Beta)

[-] When a user ran thebat.exe under Windows Vista (or later) without previously installing the
    MSI (i.e. no special registry entries were set), The Bat! did ask for file associations, but 
    couldn't set it. Now it shows an "OK" button with a shield to indicate that it requires UAC
    elevation to write all the necessary registry entries (to HKEY_CLASSES_ROOT and 
    HKEY_LOCAL_MACHINE).


[*] New command line parameters /ASSOCIATE_DefMailClient /ASSOCIATE_EML /ASSOCIATE_MSG 
    /ASSOCIATE_VCF /ASSOCIATE_MAILTO. When one of the following parameters are passed, 
    The Bat! does the necessary associations and immediately exists. It also returns an exit code
    (errorlevel) 0 in case of success and 1 in case of error.