# Sandbox.FileSystem.NormalizeFilename

```csharp
static string NormalizeFilename(string filepath)
```

Normalizes given file path so the game's filesystem can understand it. Fixes slashes and lowercases the file path.

### Parameters

- `filepath` (`string`): The file path to normalize

### Returns

`string`: The normalized file path

Declared in [Sandbox.FileSystem](/api/Sandbox.FileSystem).
Assembly: `Sandbox.Engine`.