plugin.xml

<?xml version="1.0" encoding="utf-8"?>
<plugin 
    xmlns="http://www.phonegap.com/ns/plugins/1.0" 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    id="com.phonegap.plugins.fileopener" 
    version="0.0.3">

    <engines>
        <engine name="cordova" version=">=3.0.0" />
    </engines>  

    <name>File Opener</name>

    <platform name="android">

        <js-module src="www/fileopener.js" name="FileOpener">
            <clobbers target="window.plugins.fileOpener" />
        </js-module>

        <config-file target="res/xml/config.xml" parent="/*">
            <feature name="FileOpener">
                <param name="android-package" value="com.phonegap.plugins.fileopener.FileOpener"/>            
            </feature>
        
        </config-file>
        <source-file src="src/android/FileOpener.java" target-dir="src/com/phonegap/plugins/fileopener" />
    </platform>

    <platform name="wp8">
        <config-file target="config.xml" parent="/*">
            <feature name="FileOpener">
                <param name="wp-package" value="FileOpener"/>
            </feature>
        </config-file>
        <source-file src="src/wp/FileOpener.cs" />
    </platform>
</plugin>