What is an FLS file?
An .FLS file is a file extension shared by several different software applications. Because it has multiple uses, an .FLS file can contain firmware updates, 3D laser scan data, network simulations, or recording logs.
The most common use is a printer firmware update file created by Lexmark International. These files update the internal system software on Lexmark printers.
Other common uses include network simulation project files for the Filius simulator, digital recording log notes from For The Record (FTR), and FARO Laser Scan files used by FARO Scene software. Historically, the .FLS extension was also used as a Flash Lite Sound Bundle created by Adobe Systems.
How to open FLS files?
Because an .FLS file can be many different things, you must know what software created it to open it correctly.
For Lexmark firmware, you use the official Lexmark update tools. For Filius network simulations, you open the file in the Filius application (these files are standard .ZIP archives). FTR log notes use .XML formatting and can be opened in basic text editors. FARO scan files require 3D point cloud software like FARO Scene or Autodesk ReCap.
Identifying and Inspecting FLS files
If you do not know the origin of your file, viewer.online/fls can analyze .FLS files to identify the exact format and creator software. It allows you to inspect the file structure, extract readable text (such as XML log notes or configuration data), and check whether an online preview is available.
Summary
Because the .FLS extension is used by many unrelated programs, viewer.online/fls is useful for identifying, inspecting, and understanding .FLS files without installing software or dealing with compatibility problems. It helps you quickly discover if your file is a firmware update, a 3D scan, or a network simulation.