Some Emails May Prompt You To Install Foreign Language Pack
Posted by William Diaz on June 4, 2012
From time to time, we have seen some standard company emails as well as non-company emails throw the following message prompt when clicking on or opening: “Language pack installation. To display language characters correctly you need to install the following language pack…”
It doesn’t actually matter if the message doesn’t contain any foreign characters. The reason you are seeing this is because the message’s underlying html code contains a tag that is specifying an additional language other than the default being used if it is not installed. To reveal the tag, right-click in an empty portion of the email message, select View Source from the context menu and look for Charset=####. For example:
Looking up the character set code gb2312 reveals it is assigned to the People’s Republic of China. You can find a concise list here of the various character sets: http://webtools.live2support.com/misc_htmlcharset.php.
To avoid this message prompt going forward, you can check the option to Never install any language packs and then click Cancel. If you need to undo this, the change can be done by going to HKCU\Software\Microsoft\Internet Explorer and changing W2KLpk value from 0 to 1.
This also applies to Internet Explorer when viewing websites that are encoded using foreign character sets (Outlook 2003 uses IE as its html rendering engine).
Windows Explored 
Gerdo Lansing said
In our environment, the key W2KLpk does not exist in “HKCU\Software\Microsoft\Internet Explorer”, but is does exist in “HKCU\Software\Microsoft\Internet Explorer\International”