So, where does the steam_api64r.dll file come from? A file with this exact name is created or distributed by Valve. You will never find it in a legitimate, untouched copy of a Steam game downloaded directly from the Steam servers. It is a modified, unofficial version. The extra " r " in the name typically stands for " redirected " or " reloaded ". These modified DLLs are almost always generated by third-party tools designed to replace the original steam_api64.dll . They are often found in the folders of game repacks, custom loaders, or other unofficial game builds.

If the error occurs with multiple games, the Steam client itself may be damaged. Close Steam completely. Go to > Apps > Installed Apps . Uninstall Steam.

Before running any downloaded DLL file, verify it:

These errors typically mean: