File extension CLASS (.CLASS) information

Windows cannot open CLASS files?

If Windows is unable to open file extension .CLASS you may have registry related errors or may not have the appropriate program installed. We strongly recommend that you run a free registry scan.

Appropriate program:

The .CLASS file extension is associated with Sun Microsystem's Java programming language bytecode files. When a Java compiler compiles a source code file (which will end with the file extension .JAVA) it will store the output in a .CLASS file which can then be loaded using a Java Virtual Machine.. Incorrect associations are the cause of many file extension errors. Scan your system to prevent, identify and repair CLASS file extension association errors.


  • Performance: To optimize memory and CPU usage for CLASS files run a free performance scan.
  • Stability: Fix CLASS errors to make your system and applications more stable.
  • Drivers: Scan your PC for the outdated drivers which lead to system errors and slowdowns.

You are currently viewing the detail page for ABF file extension. This page contains a detailed description of the ABF file type, software tools to help resolve file association errors in the Windows registry together with relevant system utility applications and other related information.