.CLASS File

File extension class is commonly used for Java Classes.  In the Java programming language, source files (*.java files) are compiled into (virtual) machine-readable class files.

Since Java is a platform-independent language, source code is compiled into an output file known as bytecode, which it stores in a class file.

If a source file has more than one class, each class is compiled into a separate class file, which can be loaded by any Java Virtual Machine (JVM).

MIME types:
application/java
application/java-byte-code
application/octet-stream
application/x-java-class
application/x-java.vm

Files with class extension are mainly  related to the Java programming language and used for compiled Java source codes known as Class bytecode files.

How to open:

Use any compatible IDE, or source code editor to view content of *.class files.

How to convert:

IDE programs can "build" JAR packages that including *.classes and other content.