If you’re not sure what the file type is, follow the steps below to find it: Files with the NMF extension are usually GIS Files. The file type can give you a clue as to which programs can open your NMF file. If none of these programs work, move to Step 3. Try installing the most common programs associated with NMF files, like Lightwave Narmal Map, Note-Mate Question Set, or Nuzzler Basic Rule Definition File. If the file doesn’t open when you double-click it, you may not have one of these programs on your computer. There are many different programs you can use to open NMF files. If it doesn’t open, or you see an error message, move on to Step 2. Optional Offer for File Magic by Solvusoft | EULA | Privacy Policy | Terms | Uninstall Step 1: Double-Click the Fileīefore you try any other ways to open NMF files, start by double-clicking the file icon. Download Universal File Viewer (File Magic)