>> CLASS file

CLASS file format description

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

1 filename extension(s) found in our database.

.class - Java Class

The CLASS application files are related to Java Runtime Environment. CLASS files contain bytecodes for the Java Virtual Machine, Tthey are normally produced by a compiler for the Java programming language.

Java Runtime Environment
Application files
- / -
cla, cls
Java Class related extensions:
Oracle Trace
Opera Widget
Freescale S-record File
Musepack Audio
mIRC Script

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

Can't open a .class 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.

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8, Windows 10, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, Mac OS X, iOS, Android

If you find the information on this page useful, please feel free to link to this page.

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

Please help us by rating this page below.

3/5 based on 20 reviews.
Thanks for rating!
Invalid rating.