It is not a virus.. special.exe been apart of Bit Che for years. AVG must be reporting it as a false positive. Please submit the sample to AVG so that they can flag it as safe from now on.
Also, you can get the latest version of special.exe from here:
http://convivea.com/forums/index.php?topic=614.0Special.exe handles the Special Logins that some sites require.. such as CAPTCHAS or SSL, JavaScript, Ajax, etc that Bit Che's normal login system can't handle. In other words, it can be used to login into pretty much any site and allow Bit Che to use those cookies.