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You can install third party applications directly on your BlackBerry from your Blackberry over the air. Most application developers will provide direct links to the .jad or .jar files required for internal installation on your BlackBerry. There is usually a second option for download to your desktop and installation via the BlackBerry Desktop Manager.The Various File Types You Will Encounter* .JAD files: An application descriptor that stores information about the application itself and the location of .COD files* .JAR files: a JAR file (or Java ARchive) is used for aggregating many files into one. It is generally used to distribute Java classes and associated metadata.* .COD files: A COD file is a proprietary file format developed by RIM that contains compiled and packaged application code.* .ALX files: Similar to the .JAD file, in that it holds information about where the installation files for the application are locatedsource: [http://www.bbgeeks.com/blackberry-guides/blackberry-guide-how-to-install-third-party-applications-onto-your-blackberry-88400/ BlackBerry Guide: How to Install 3rd Party Applications on Your BlackBerry]