Identifying program module functionality needed by a computer when disconnected from a network is disclosed. A document identification engine (DIE) creates a list of files stored locally on the computer. The DIE sends the list of files to a document mapping engine (DME). The DME identifies a proper handler routine for each file in the list of files and sends each file to the proper handler routine(s). The handler routine(s) identifies the application functionality needed to execute each file. The application functionality may include products, features and components. The handler routine sendsd a list of needed application functionality to the DME. If needed, the DME may send any sub-parts of files to another handler for further processing, such as when a word processing document includes a spreadsheet subpart. The DME also can send the list of needed application functionality to a migration engine (ME). The ME determines the current status of the needed application functionality. If the status of the needed application functionality indicates that the needed application functionality is not installed locally on the computer, then the ME installs the needed application functionality to the computer.