A: No. Commentary is stored in dt43_eng.cpk (for English) and dt44_eng.cpk (stadium ambience). You need those separately.
: Ensure English commentary is selected and active in the game's audio settings. Where to Find Downloads
If you own a legitimate copy of PES 2017 (from Steam or DVD), the file is already in your Data folder. You don't need to download it. Simply verify game integrity:
CPK files are used in various games, including the Pro Evolution Soccer series, as container files to store game data such as textures, models, and other assets. These files are usually not meant to be opened or edited directly by players but are crucial for the game's operation.