Filename Extensions
If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .class

2 extension(s) and 0 alias(es) in our database

Below, you can find answers to the following questions:

  • What is the .class file?
  • Which program can create the .class file?
  • Where can you find a description of the .class format?
  • What can convert .class files to a different format?
  • Which MIME-type is associated with the .class extension?
Java Class Data .class file icon

Java Class Data

CLASS file is a Java Class Data. CLASS file contains bytecodes for the Java Virtual Machine. Java is a class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible.
Detailed description not available
Category: Application files
Program name: -
Mime-type: application/java-vm
Magic bytes (HEX): -
Magic string (ASCII): -
cla, clas, cls
Related extensions:
Java Source Code
JRun Server Application
Java Enterprise Archive
BlackBerry COD Archive
Java Serialized Object
Velocity Macro File
JBuilder Project
JavaCard Converted Applet
Tag Library Descriptor
Gambas V2 Class Data .class file icon

Gambas V2 Class Data

CLASS file is a Gambas V2 Class Data. Gambas is a free development environment based on a Basic interpreter with object extensions.
Detailed description not available
Category: Development files
Application: Gambas
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
BASIC Source
Gambas V2 Form
Gambas V2 Application
microBasic Source Code
microC Binary File
microC Library

Other types of files may also use the .class file extension. If you have helpful information about .class extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

Java Class Data

The .class filename extension is often given incorrectly!

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

cass (1)

Can't open a .class file?

If you want to open a .class file on your computer, you just need to have the appropriate program installed. If the .class association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.class

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 from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2003/2008/2012/2016, Windows 7, Windows 8, Windows 10, Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, iOS, Android