A playback device generates a virtual package in response to a construction request made by an application. After the virtual package is thus generated, a virtual file system 23 allows a file recorded on a removable medium in an 8.3 format to be accessed with use of an alias in a Long File Name format, based on a merge management information file that indicates a correspondence between a file path in the 8.3 format and a file path in the Long File Name format.