> ## Applet packaged as `.cab` file results in `java.lang.ClassNotFoundException` thrown when applet runs.

> ###
> Symptoms

> > When running an applet in a browser using the Sun JRE, a `ClassNotFoundException` is thrown by the `ClassLoader`. The same applet runs under the Microsoft VM.

> ### Cause

> > This error is caused by applets being packaged as `.cab` files. The `.cab` file is an archive format specific to Microsoft Windows, and it is not supported by the Sun JRE.

> ### Resolution

> > The workaround is to extract the applet classes and resources from the `.cab` files and repackage them as `.jar` files using the `jar` tool from JDK:

> > `jar cvf <jar_file> <input_files>`

> > The `<APPLET>` tag in the HTML page will also need to be modified to specify the `.jar` files in the `archive` attribute. For example,

> > `<APPLET code="MyApplet" width=100 height=100>
> > <PARAM name="cabbase" value="package1.cab, package2.cab">
> > </APPLET>`

> should be modified as follows:

> > > <`APPLET code="MyApplet" archive="package1.jar, package2.jar" width=100 height=100>
> > > </APPLET>`

> ### Related Information

> Please refer to the JAR tool documentation for more details.