Navigate to your Far Cry 4 installation folder and open the bin directory. The default path for a Steam install is C:\Program Files (x86)\Steam\steamapps\common\Far Cry 4\bin . Copy both Extreme Injector v3.exe and dualcore.dll into this bin folder.
Before applying anything, ensure that the fix or patch you're planning to inject is specifically designed for Far Cry 4 and dual-core processors. far cry 4 dual core fix extreme injector link
To resolve the black screen issue at startup, follow these steps provided by PCGamingWiki Steam Community Steam Community Extract Files Extreme Injector v3.exe dualcore.dll into your game's folder (e.g., Far Cry 4/bin/ Run as Administrator : Right-click the injector and select Run as administrator Configure Injector Process Name FarCry4.exe : Click "Add DLL" and select the dualcore.dll from your bin folder. Auto-Inject Settings within the injector, ensure Auto Inject is checked, and click OK. Launch Game FarCry4.exe Navigate to your Far Cry 4 installation folder