FEK file - How do I open a .fek file?
The table below provides useful information about the .fek file extension. It answers questions such as:
- What is the .fek file?
- What program do I need to open a .fek file?
- How can the .fek file be opened, edited or printed?
- How can I convert .fek files to another format?
Table of Contents
- ✅ Altair FEKO Input Data
- 🔄 .fek file converters
- 🚫 .fek file related errors
We hope you find this page helpful and a valuable resource!
1 extension(s) and 0 alias(es) found in database
✅ Altair FEKO Input Data

The FEK file is an Altair FEKO Input Data. Altair Feko is a comprehensive computational electromagnetics (CEM) code used widely in the telecommunications, automobile, space and defense industries.
Other types of files may also use the .fek file extension.
🚫 The .fek 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 .fek 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:
Windows cannot open this file:
example.fek
To open this file, Windows needs to know what program you want to use to open it...
If you don't know how to set the .fek file association, check the FAQ.
🔴 Can I change the extension of files?
Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.
If you have helpful information about the .fek file extension, write to us!