The .cod file is basically a private version of the .jar BlackBerry file. (This is usually a version downloaded from the App Store.)
The .cso file is a helper file used when signing an application. (He says which keys are needed.)
The .debug file is a helper file used when launching the application in the debugger.
A .jad file describes an application to help a device know if it is compatible. (If you downloaded to BlackBerry from a website instead of the App Store, this is the file to which you point your link, which will contain the path to cod / jar.)
The .jar file is the main MIDP application file, which is a kind of generic Java environment for Java.
The .rapc file is a helper file used by BlackBerry JDB when compiling / building a project.
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