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C18 file extension

The table below provides useful information about the .c18 file extension. It answers questions such as:

  • What is the .c18 file?
  • What program do I need to open a .c18 file?
  • How can the .c18 file be opened, edited or printed?
  • How can I convert .c18 files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ Catia V4 Sequential Data

C18 file is a Catia V4 Sequential Data. CATIA (Computer Aided Three Dimensional Interactive Application) is a multi-platform CAD/CAM/CAE commercial software suite developed by Dassault Systemes and marketed world-wide by IBM.
C18 format description not yet available
Category: Data files
Application: Catia
Mime-type: application/catia
Magic number: -
Magic string: -
Sample: -
C18 aliases:
C18 related links:
C18 related extensions:
Catia Document

Catia V5 Part Description Document

Catia V5 Product Description Document

Catia V5 Drawing

Catia Drawing

Catia Highly Compressed Graphics

Catia V4 Session

Catia IGES Document

Catia Library

Catia Catalog

Other types of files may also use the .c18 file extension.

🚫 The .c18 file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

c1, v18

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

SYNETSIM QuickBasic Source Code
POV-Ray Include File

🔴 Can't open a .c18 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:


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 .c18 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 .c18 file extension, write to us!

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