double extension


Also found in: Dictionary, Thesaurus, Medical, Legal.

double extension

A way to trick users into opening a virus. Many people have learned that text files (.TXT) and image files (.GIF, .JPG, etc.) are safe to launch because they are data and not executable software. They have learned to be leery of .EXE, .VBS and other extensions that are executed immediately. Thus, virus writers try to trick more people using double extensions, so "I LOVE YOU.TXT.vbs" is really not a .TXT file, but a .vbs file, a Visual Basic Script that is executed immediately.

You Need to See the Extension
Some mail programs may actually remove the .vbs at the end of the name, leaving users completely helpless to make a determination even if they knew what to look for. This mentality is pervasive. Out of the box, Windows defaults to hiding file extensions in all displays, which is beyond absurdity considering the importance of this file identifier in everyday operations. See dangerous extensions and Love bug.
References in periodicals archive ?
CPAs can recommend employers and clients adopt the IPIC method with confidence that it will result in a more highly predictable outcome and greatly reduce the administrative and computational burdens of traditional double extension and link-chain Lifo.
The latest new and overstock cosmetics products sold include items such as the latest mascaras like voluminous mascara, double extension and telescopic explosion mascara.
An onboard crane handles drill rods and features a double extension boom for extended reach.
At the center of a dollar-value LIFO calculation using the double extension method is the requirement that all items in ending inventory be revalued at their respective base-year costs.
The attachment name varies, but it always has double extension such as .