# Opening a document

> How to open DjVu files in Niraqua DjVu and set it as your default viewer.

Source: https://niraqua.com/djvu/help/opening/

*Using an iPhone or iPad? See [On iPhone and iPad](https://niraqua.com/djvu/help/ios/).*

## Supported files

Niraqua DjVu opens DjVu documents, the `.djvu` (and `.djv`, `.djvm`) files produced by
scanners and DjVu encoders. Both single-page and multi-page documents are
supported.

## Ways to open a document

- **Double-click** a `.djvu` file in Finder (once Niraqua DjVu is the default
  app for DjVu files - see below).
- **Drag** a `.djvu` file onto the Niraqua DjVu icon in the Dock.
- **From the app**, choose **File > Open** and pick a `.djvu` file, or reopen a
  recent one from **File > Open Recent**.
- **Right-click** a `.djvu` file in Finder and choose **Open With > Niraqua
  DjVu**.

Each document opens in its own window, so you can read several at once.

## Make Niraqua DjVu the default

To open every DjVu file with Niraqua DjVu automatically:

1. Select a `.djvu` file in Finder.
2. Choose **File > Get Info** (`⌘` `I`).
3. Under **Open with**, choose **Niraqua DjVu**.
4. Click **Change All...** and confirm.

After this, double-clicking any `.djvu` file opens it in Niraqua DjVu.

## If a file will not open

A damaged or partially downloaded file may fail to open. See
[Troubleshooting](https://niraqua.com/djvu/help/troubleshooting/) for what to check.