A method and system for preparing a program for customization. The customization system "compiles" a computer program by identifying the content of each statement of the computer program that may be customized. The customization system identifies the type associated with each statement. Based on the type of statement, the customization system identifies content of the statement that can be customized and stores the identified content in a custom content bundle. The customization system then replaces the identified content in the statement with an include content command that includes the content identifier of the corresponding content. When the computer program is executed, the include content command of the statement causes the retrieving of a content associated with its content identifier from a custom content bundle.