QuickBooks file extension is basically the extension used at the end of the file name, which defines the purpose of the file. It is generally in the form .xxx. The QB file extension basically helps the user in identifying the files and finding out the what purpose is to be served by each of the files. QuickBooks file extensions are essential for the users to identify the file and avoid any kind of mess related to the data. How significant are QuickBooks file extensions? It should be noted that the every QuickBooks file extension carries a different significance and server different purpose. Let us check out how significant are file extensions: Determining the type of content a particular file is containing becomes easy for the users with extensions. With extensions, it is possible for the user to categorize the same kind of the QuickBooks file extension to keep the accounting data categorized and prevent data from merging. The extensions help in identifying the file type, which can ultimately help the desktop to launch the file in the right application. They also assist in verifying the authentication of data files in a manner to secure them. By simply looking at the file extension, the user will be able to identify the file type and save a lot of time.