You're here because you have a file that has a file extension ending in .ulf. Files with the file extension .ulf can only be launched by certain applications. It's possible that .ulf files are data files rather than documents or media, which means they're not meant to be viewed at all.

Certain GIS (Geographic Information System) applications associated to particular GPS devices and location mapping gadgets use these universal list files, and a universal list file is implemented with data formatting attributes based on ULF (Universal List Format) standards. A universal list file is integrated with data compilation and encoding specifications used for the generation of GIS data files stored in the ULF file format. Appended witht he .ulf extension, the content of a universal list file may include map vertices and location coordinates entered by a user of a supported GIS application corresponding to a set of compatible GPS devices and map charting gadgets. Users with computers running on Microsoft Windows-based systems can try installing a GIS application associated to widely used GPS and chart mapping devices to possibly implement support into the system for creating and opening or editing these universal list files. Mac and Linux users can on the other hand try using popular GIS applications developed for GPS and mapping gadgets designed for Mac and Linux platforms to start creating, viewing and modifying the content stored in these universal list files.

Launch a .ulf file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .ulf file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .ulf files aren't yet associated with it. In this case, when you try to open a .ulf file, you can tell Windows which application is the correct one for that file. From then on, opening a  .ulf file will open the correct application. Click here to fix .ulf file association errors

Be careful not to rename the extension on .ulf files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

A file extension is the set of three or four characters at the end of a filename; in this case, .ulf. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.