NUM file: How can I open a .NUM file?
The table below provides useful information about the .num file extension. It answers questions such as:
- What is the .num file?
- What program do I need to open a .num file?
- How can the .num file be opened, edited or printed?
- How can I convert .num files to another format?
We hope you find this page helpful and a valuable resource.
✅ Nikon Capture Unsharp Mask

The NUM file is a Nikon Capture Unsharp Mask. Nikon Capture is a digital-image processing and editing software application for digital photographers. It is a professional quality non-destructive developer and editor for Nikon RAW (NEF) files.
✅ Nashville Number System Chord

The NUM file is a Nashville Number System Chord. The Nashville Number System is a method of transcribing music by denoting the scale degree on which a chord is built.
✅ DICTION Data

The NUM file is a DICTION Data. DICTION is a computer-aided text analysis program for Windows and Mac.
⚠ Be careful with .num files.
It's important to know that the .num file extension can be used by various programs, not just the ones you expect. This includes potentially harmful software or malware that might create .num files. Be cautious when dealing with .num files from unknown sources.
🚫 The .num file extension is often given incorrectly!
According to the searches on our site, these misspellings were the most common in the past year:
Is it possible that the filename extension is misspelled?
We found the following similar file extensions in our database:
🔴 Can't open a .num file?
When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:
Select an app to open this .num file
It means that the operating system does not have a default app associated with the .num file type. To resolve this issue and open the file, you can take the following steps:
- Right-click on the .num file. A context menu will appear.
- From the context menu, select Open with. Windows will display a list of recommended apps.
- If the desired app is listed, select it from the provided options.
- If you cannot find the appropriate app, you may need to install software that supports the specific file type.
If you don't know how to change the default app for the .num file, check the FAQ.
🔴 Can I change the extension of files?
Changing the filename extension of a file is not a good idea. The extension of a file serves as a hint to the operating system and various software programs about the type of data contained within the file. When you alter a file's extension, you essentially modify how software applications interpret and handle that file. Every file has a specific format, also known as its file type or file format. The problem is, changing the file extension does not change the file format.
If you have helpful information about the .num file extension, write to us.