Before downloading anything new, check your antivirus (or Windows Defender) history. Open your Antivirus settings. Look for "Quarantined Items" or "Threat History."
Go to PES-Patch.com and search for "steam_api.dll PES 2016" – their official patch archives include the original DLL as part of their "clean files" backup. Avoid any site with three pop-up ads and a fake "Download Now" button. steam api dll pes 2016 link
When a legitimate, Steam-purchased copy of PES 2016 runs, steam_api.dll handles: Before downloading anything new, check your antivirus (or
If nothing works, uninstall PES 2016 via Steam, delete the folder manually, then reinstall. This guarantees a fresh set of all files, including steam_api.dll . Before downloading anything new
Steam will scan every file. Any missing or corrupted file (including steam_api.dll ) will be re-downloaded from Valve’s official servers.