This specific file name, "PPPD-305-U.part14.rar" , appears to be a segmented archive part for a specific video release, likely associated with Japanese adult media (AV) based on the "PPPD" prefix (often used by the Prime Pictures studio).
A: Check for a file named PPPD-305-U.partNN.rar (NN = total number). For example, if the last file is part30.rar , you need all parts up to 30. PPPD-305-U.part14.rar