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>> JAR file

JAR file format description

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

1 filename extension(s) found in our database.

.jar - Java Archive

The JavaTM Archive file format enables you to bundle multiple files into a single archive file. Typically a JAR file contains the class files and auxiliary resources associated with applets and applications.

.jar file format description:
JAR format
Java Runtime Environment
Archive files
- / -
Java Archive related links:
Java Archive related extensions:
Java Class
Java Network Launch Protocol Descriptor
Java Manifest File
Java Properties File
Java Web Archive

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

Can't open a .jar 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 .jar file extension is often given incorrectly!

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

ajr, uar, mar, jxr, jag, jad, iar, ar, yar, nar, kar, jwr, jaf, ja, har

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

JpgfDraw Drawing ASCII
EMC NaviSphere Analyzer Archive
RuneScape Data
Midtown Madness 2 Game Data
Uniface Deployment Archive
Rocket LegaSuite GUI Runtime

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If you have useful information about the .jar file format, then write to us!