What is a C4 file?
A .C4 file usually stores a MEDUSA CAD drawing or a CATIA V4 technical drawing. It can also be a JEDMICS Image File managed by the JEDMICS military document system. Other uses include Cimage technical drawing raster images, Microsoft OneNote cache files, or Orbx scenery packages for X-Plane 11. Because the .C4 extension has multiple possible meanings, you must identify the actual format of the file before opening it.
How to open C4 files?
If your file is a MEDUSA drawing, you need MEDUSA software by CAD Schroer. If it is a CATIA V4 drawing, you need CATIA by Dassault Systèmes. Because these are professional engineering tools, a web-based inspector is often the fastest way to check the file contents without a license.
Best practices and troubleshooting
viewer.online/c4 analyzes .C4 files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. If the analysis shows your file is an X-Plane 11 scenery package, you can rename the extension to .ZIP and extract it with any standard archive utility.
File conversion
You often need to share CAD drawings with people who use different software. We recommend file conversion to sensible target formats on convert.guru. For a .C4 CAD file, the best target formats are .DWG, .DXF, or .PDF.
Summary
viewer.online/c4 directly opens and previews .C4 files in the browser, eliminating the need to install software or troubleshoot compatibility issues.