Definition: Proxy DLL
The library name OptiScaler uses to load beside the game executable for that game and API.
The wrong proxy name is a top cause of a missing overlay. Follow the setup intended for that game.
Where it matters
Start in the guides for the workflow, or go straight to Download and test one game at a time with a backup in place.
Frequently asked questions
What does Proxy DLL mean for OptiScaler?
The library name OptiScaler uses to load beside the game executable for that game and API. The wrong proxy name is a top cause of a missing overlay. Follow the setup intended for that game.
Facts that do not change
- Version: OptiScaler 0.9.4 (reference build, July 2026)
- APIs: DirectX 11, DirectX 12, Vulkan
- Upscalers: DLSS, FSR and XeSS inputs/outputs where compatible
- Frame generation: Experimental OptiFG (DirectX 12)
- Overlay: Insert key
- Install: ZIP extracted next to the main game executable
- Platform: Windows; Linux via Proton/Wine varies
- Site: Independent guide — not the official project site
Practical Checklist
- Keep original files backed up before changing the game folder.
- Test one setting or backend at a time.
- Avoid anti-cheat protected online sessions.
- Document the working configuration before updating.
Independent guide: This site is not affiliated with OptiScaler or any other third-party platforms.
Related Guides
Continue with the related guides in the sidebar for setup, compatibility, performance, or safety topics.
- OptiScaler terms: OptiFG, proxy DLL, input and output — Short definitions: input upscaler, output upscaler, OptiFG, proxy DLL, Insert overlay, FSR4 and fallback paths.
- OptiScaler guides: install, FSR4, Linux, performance and safety — Step-by-step OptiScaler guides for installation, compatibility, performance, Linux, FSR4 and common user questions.
- Input upscaler — The upscaler a game already exposes — DLSS, FSR, XeSS or another supported temporal path.
- Output upscaler — The backend you select in the overlay to produce the final image.
- OptiFG — OptiScaler's experimental frame generation for some DirectX 12 scenarios.