The re5dx9.exe file is the original DirectX 9 executable launcher for the PC version of Resident Evil 5. If you are trying to download or fix this specific file, you are likely dealing with compatibility issues on a modern Windows operating system. Understanding the re5dx9.exe File
If you are using the older "Games for Windows Live" (GFWL) version, you may need to use the G4WLOriginalVersion Resident Evil 5 Re5dx9 Exe Download