What Is an ARJ File?

How to Open, Edit and Convert ARJ Files

Picture of the ARJ file icon

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

Before you can open an ARJ 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 .ARJ file extension refers to.

What Is an ARJ File?

A file with the ARJ file extension is an ARJ Compressed file.

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

How to Open an ARJ File

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

ARJ files can be opened with any popular compression/decompression program. I like 7-Zip and PeaZip, but there are several free zip/unzip tools to choose from.

Regardless of the one you choose, any of these types of programs will decompress (extract) the contents of an ARJ file and some may also have the ability to create ARJ compressed files.

If you know anything else about ARJ files, including any other (preferably free) programs that work with ARJ files, please let me know so I can update this page.

Tip: Use Notepad or another text editor to open the ARJ 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 ARJ files but it's worth a try.

If you find that an application on your PC does try to open the ARJ file but it's the wrong application or if you would rather have another installed program open ARJ 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 ARJ File

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

The first option involving opening the ARJ 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 ARJ files, a third-party file conversion tool (the second option) could be very useful.

Important: You cannot usually change a file extension (like the ARJ 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 ARJ 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 ARJ file and I'll see what I can do to help.