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>> EFW file

EFW file format description

Many people share .efw files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .efw file can be edited, converted or printed with. On this page, we try to provide assistance for handling .efw files.

1 filename extension(s) found in our database.

.efw - CA Security Renamed File

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.

.efw file format description:
EFW format
Other files
- / -
CA Security Renamed File related links:
CA Home
CA Security Renamed File related extensions:
VGA Graphics Configuration
Adobe Photoshop Extension Plugin
Adobe Zip-based Creative Suite Extension
General Firmware File
General Project File
Blizzard Encrypted MoPaQ File

Naturally, other applications may also use the .efw file extension. Even harmful programs can create .efw files. Be especially cautious with .efw files coming from an unknown source!

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 can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

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:

dfw, sfw, fw, ewf, efs, efe, efa, edw, ebw, wfw, rfw, ffw, etw, efq, efd

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Derive for Windows Data
Seattle FilmWorks Image
Enter-Tech Recorded Audio
Ensoniq ASR File
SmartWare Cross-Tab Definition File
Windows Firewall Exported Rules

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