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Common File Extensions

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.JAR File Extension

Run a free scan for .JAR file extension errors.

File Type Java Archive File
Category Executable Files
Common? No
File Description Archive that contains multiple Java files and is compressed using .ZIP compression; stores Java classes and metadata and may be digitally signed; runs as a program if the Java Runtime Environment (JRE) is installed on the computer.

JAR files are used by Mozilla Firefox, Thunderbird, SeaMonkey, and Sunbird to store themes and add-ons.
Program(s) that open jar files
Mac OS Mac OS Java Runtime 1.1 or later
Web browser with Java support
Windows Windows Java Runtime 1.1 or later
Web browser with Java support
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Updated 3/5/08
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