A computer includes an application system, a storage device and a basic input output system (BIOS). The application system can be respectively coupled to the storage device and the BIOS, set at least a multimedia file as a preset playing file according to an input instruction and store the preset playing file into the storage device. The application system can further generate a log file according to the input instruction and the storage position of the preset playing file, wherein the log file is sent to the BIOS. The BIOS has a file access module, so that the BIOS can acquire the preset playing file from the storage device according to the log file for playing during booting the computer.