---
title: kMDItemFSIsExtensionHidden
framework: coreservices
role: symbol
role_heading: Global Variable
path: coreservices/kmditemfsisextensionhidden
---

# kMDItemFSIsExtensionHidden

Indicates whether the file extension of the file is hidden. A CFBoolean.

## Declaration

```swift
let kMDItemFSIsExtensionHidden: CFString!
```