Software & Apps File Types What Is a DIRECTORY File? How to open, edit, & convert DIRECTORY files Share Pin Email Print File Types Design Cryptocurrency MS Office Windows Linux Google Drive Apps File Types Backup & Utilities View More By Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated December 04, 2019 A file with the DIRECTORY file extension is a KDE Folder Parameters file, or sometimes called a KDI Folder View Properties file. Every folder in a Linux-based operating systems that uses .DIRECTORY files will have its own .DIRECTORY file that specifies options for that particular folder, including the name, icon, and other details. A folder (like one that holds your music collection, images, etc.) is also referred to as a "directory," but it's not the same as the DIRECTORY file format. How to Open a DIRECTORY File The operating system using the .DIRECTORY file will use it as is - you don't need to install any third-party programs to open it. In Linux, what opens this type of file is called KDE, which stands for K Desktop Environment. Patrick George / Getty Images However, you should be able to use a free text editor like Notepadqq to open a .DIRECTORY file to display (and possibly edit) its contents. Are you trying to open a folder in a terminal or Command Prompt, and not a .DIRECTORY file? In a terminal, use the open command as seen in this Stackoverflow example. See iSunshare's tutorial if you need help using the start command to open a directory in Command Prompt. How to Convert a DIRECTORY File There shouldn't be any reason to convert a .DIRECTORY file to another format because it would just make the file unusable. If you're wanting to convert a directory (folder) full of files, and not a .DIRECTORY file, there are a variety of free file converters. You can use them to convert images, audio files, videos, and more. Something a little different that you might be after is converting a directory listing to a text file so that you can have a list of all the files that are in that folder. This can be done in Windows with the dir command. Lots of programs can convert a directory of files to the ISO format: WinCDEmu, MagicISO, and IsoCreator are just a few examples. Similar are file compression utilities like 7-Zip and PeaZip that can convert directories/folders to ZIP, RAR, 7Z, and other archive formats. Still Can't Open Your File? If your file doesn't open with the suggestions from above, double-check the file extension to make sure it actually reads as ".DIRECTORY" and not something similar like ".DIR." Files with the .DIR suffix are Adobe Director Movie files that open with the now discontinued Adobe Director software, and are not at all related to DIRECTORY files. Another example is the Rich Text Format Directory file format that uses the RTFD file extension. These are text files used on macOS that might contain images, fonts, and other files like PDFs, but they too are not related to DIRECTORY files, and instead open with Apple's TextEdit program, Bean, or theLibrarian.