In the beneath section, we have gathered the number of Quicken Data File Extension for Windows, Mac, and DOS. However, multiple Quicken Data Files could be accessed especially when you would like to keep accounts separate. In general, Quicken stores all data for a group of accounts and transactions in a single data file. Furthermore, Quicken always stores downloaded data in the default location depending on the version of your Quicken. Quicken is personal financial management software that allows managing expenses, generating monthly income, tacking investments, and more. Stay tuned with this article to learn all about the set of file extensions and the right ways to open them. But, if that particular application is not appearing in the computer, you probably face problems while opening the related document. However, it is also true that Windows uses a default program to open the Quicken data file. All these extensions are named according to the operation they execute. Though, there are numerous types of Quicken file extensions such as: qel. Such a group of characters used at the end of the filename is called Quicken Data File Extension. When you download the data file in Quicken, a specific set of characters is added at the end of the filename.