File Types

This page is a practical map of the files you will encounter while using Vespera.

Project and world files

Extension	Purpose
`.vesperaproject`	Project-wide settings, startup assets, input bindings, scripting/build configuration.
`.slscene`	Scene Text file containing world/sector data, entities, components, script attachments, and scene resources.
`.slprefab`	Reusable entity prefab. Instances receive fresh scene entity IDs.
`.vmeta`	Asset metadata sidecar containing the stable asset ID and importer settings.

Content assets

Extension	Purpose
`.slmat`	Material asset. Can reference a base texture by stable asset identity.
`.slspriteclip`	Sprite animation clip.
`.slspritesheet`	Sprite-sheet descriptor pointing at a source texture.
`.slaudio`	Audio-clip descriptor. The current clip importer resolves a WAV source asset.
`.png`, `.jpg`, `.jpeg`, `.bmp`, `.tga`	Texture sources recognized by the asset catalog.
`.wav`, `.ogg`, `.mp3`	Audio sources recognized by the asset catalog. Direct engine audio playback support depends on the runtime path you use; `.slaudio` currently resolves WAV sources.
`.ttf`, `.otf`	Font sources.

UI files

Extension	Purpose
`.rml`	RmlUi document for production runtime UI.
`.rcss`	RmlUi style sheet.
`.slui`	Legacy Vespera UI document. Kept for compatibility and tooling; RmlUi is the production UI path.

Gameplay code

Extension	Purpose
`.cs`	Project-owned C# gameplay code using `Vespera.NET`.
`.csproj`	Managed project built into the game's configured assembly.
`.lua`	Optional project-level Lua entry script.

Generated package files

A standalone export writes a package manifest and package report beside the built game. These files describe what Vespera packaged and are useful when diagnosing missing assets or deployment problems.

Stable identity matters: when moving assets, use the editor's Move / Rename… workflow where possible. It can preserve stable IDs and repair references that would otherwise become stale.