CAC file format description

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

1 filename extension(s) found in our database.

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

Can't open a .cac 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:

example.cac

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.

• Open Control Panel > Control Panel Home > Default Programs > Set Associations.
• Select a file type in the list and click Change Program.

The .cac file extension is often given incorrectly!

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

ac, vac, fac, cxc, cca, cax, cas, cad, acc, xac, sac, dac, cwc, cc, cav

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

.ac

GNU Autoconf Input File

.sac

Single Assignment C Code

.cc

STK City Database Counties

.caf

Core Audio Format

.ac

CaseWare Working Papers Client File

.sac

IRIS SAC File

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