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Details of the .efw file extension

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

  • What is the .efw file?
  • What program do I need to open a .efw file?
  • How can the .efw file be opened, edited or printed?
  • Where can I find the specifications for .efw?
  • Which MIME-type is associated with the .efw extension?
  • How can I convert .efw files to another format?
  • What are other, similar filename extensions to .efw?

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

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

.efw file extension details

CA Security Renamed File

CA Security Renamed File .efw file icon
EFW file is a CA Security Renamed File. If your computer has CA Security Center installed, it will automatically rename downloaded (executable or compressed) files to an EFW extension. You can fix the file extension by renaming the file with the correct extension.
Category: Other files
Application: -
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
EFW aliases:
EFW related links:
EFW related extensions:

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

.efw file extension error

The .efw file extension is often given incorrectly!

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

ecw, fw, dfw, ewf, efd, efa, sfw, ef, efs, efe, etw, rfw, efq

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Enhanced Compression Wavelet
EasyCAD for Windows Drawing
General Firmware File
Derive for Windows Data
EnCase Expert Witness Compression Format Data
SmartWare Cross-Tab Definition File
EARS Filter Definition
Seattle FilmWorks Image
Diploma Exam File
Euphoria Include File
open .efw file

Can't open a .efw 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 .efw file association, check the FAQ.

.efw file extension

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 .efw file extension, write to us!

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