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What is an AAC File?

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Question: What is an AAC File?

Did you find an AAC file on your computer and wonder what program should open it? Maybe someone emailed you an AAC file but you're not sure how to use it. Perhaps you tried to open the AAC file but Windows told you that it could not open it.

Before you can open an AAC file (assuming it's even a file format that's intended to be viewed or edited), you'll need to determine what kind of file the .AAC file extension refers to.

Answer: A file with the AAC file extension is an MPEG-2 Advanced Audio Coding file.

Other types of files may also use the AAC file extension. If you know of any additional file formats that use the .AAC extension, please let me know so I can update this information.

How To Open an AAC File:

The easiest way to open an AAC file is to double-click on it and let your PC decide which default application should open the file. If no program opens the AAC file then you probably don't have an application installed that can view and/or edit AAC files.

Warning: Take great care when opening executable file formats received via email or downloaded from websites you're not familiar with. See my List of Executable File Extensions for a listing of file extensions to avoid and why.

AAC files can be opened with Windows Media Player, and likely many other multi-format media players. If you know of any other programs that open or edit AAC files, please send me a quick email and let me know the name of the program so I can update this page.

Tip: Use Notepad or another text editor to open the AAC file. Many files are text-only files meaning no matter the file extension, a text editor may be able to properly display the file's contents. This may or may not be the case with AAC files but it's worth a try.

If you find that an application on your PC does try to open the AAC file but it's the wrong application or if you would rather have another installed program open AAC files, see my How To Change the Default Program for a Specific File Extension guide for making that change in Windows.

How To Convert an AAC File:

There are two main ways to attempt to convert an AAC file to another file type:

The first option involving opening the AAC file in its native program is preferable because it's both easier and will probably result in a more accurate file conversion. Of course if you don't have a program that opens AAC files, a third-party file conversion tool (the second option) could be very useful.

Important: You cannot usually change a file extension (like the AAC file extension) to one that your computer recognizes and expect the newly renamed file to be usable. An actual file format conversion using one of the methods described above must take place in most cases.

Still Having Problems Opening or Using an AAC File?

See Get More Help for information about contacting me on social networks or via email, posting on tech support forums, and more. Let me know what kinds of problems you're having with opening or using the AAC file and I'll see what I can do to help.

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