Quick answer
If Neverway Prologue will not launch, the developers recommend adding either /gldevice:Vulkan or /gldevice:D3D11 to Steam launch options. Try one option at a time, not both together.
Verified July 17, 2026. This guide separates confirmed facts from unannounced features.
Fix 1: select a graphics device
- Open Steam Library and right-click Neverway Prologue.
- Select Properties, then General.
- Enter
/gldevice:Vulkanin Launch Options and start the game. - If it still fails, replace that text with
/gldevice:D3D11and test again.
These are the two launch strings published in the game’s official FAQ. Remove the option after testing if it makes no difference.
Fix 2: Windows 11 blocking
The official FAQ also notes that Windows 11 Smart App Control can block startup. Check Windows Security notifications first so you know whether Windows actually blocked the executable. Turning off a security feature changes protection for the whole device, so use that as a last resort and only if the block is confirmed.
If neither option works
Confirm that the PC meets the minimum 64-bit OS, 2.0 GHz processor, 2 GB RAM, Shader Model 3.0 graphics, DirectX 11, and 1 GB storage requirements. Update the graphics driver, verify the game files in Steam, and include OS, GPU, launch option tested, and the crash point in a bug report. The developers direct bug reports to the Steam forum or official Discord.
Frequently asked questions
Should I type both launch options?
No. Test Vulkan and D3D11 separately.
Where are Steam launch options?
Right-click the Prologue in your Steam Library, choose Properties, then General.
Verification sources
Neverway Guide is an unofficial fan site. Store and developer pages take priority when details change.