What is a UNL file?
A .UNL file has multiple possible meanings depending on the software that created it. Most commonly, it is a network simulation lab file used by EVE-NG (formerly Unified Networking Lab). These files store network topologies and device settings in the XML format. Another frequent use is as a database data unload file for the IBM Informix database, which stores exported data rows as plain text.
Other systems also use .UNL files for specific data exchange. The Czech Foreign Police uses them for foreigner accommodation report files. The Moroccan Treasury uses them for Moroccan bulk transfer orders. Additionally, Garmin uses the .UNL extension for a Garmin Unlock File, which authenticates map data on GPS devices.
How to open UNL files?
Because the .UNL extension applies to different formats, the correct software depends on the origin of the file. You can import network lab files directly into the EVE-NG web interface. You can read IBM Informix unload files using command-line database tools or standard text editors. You can process a Garmin Unlock File using Garmin Express or by placing it directly on the device storage.
Software and tools
If you have a .UNL file, you can often inspect its contents using a basic text editor like Notepad or Vim, since many of these files use plain text or XML. However, to use the file properly, you need the specific host software.
If you do not know the origin of your file, viewer.online/unl analyzes .UNL files to identify their exact format and creator software. The tool shows which programs can open the file and usually previews it directly in your browser.
Summary
Because .UNL files often use the known XML format or plain text, viewer.online/unl can safely open and display them online, eliminating compatibility problems.