AVI files can contain older video and audio codecs. VLC may be a suitable default for a collection of legacy clips, but successful decoding depends on the actual media streams inside each AVI file.
Method 1: Use Finder
- In Finder, select a sample file such as clip.avi.
- Press Command–I, or choose File → Get Info.
- Expand Open with and choose VLC. If it is missing, choose Other and locate the installed app.
- Click Change All and confirm the macOS prompt.
- Double-click another file of the same type to check the new default.
Method 2: Manage associations with Pahkui
Pahkui lets you browse by app or by format. When setting up an editor for several file types, you can inspect the current defaults and review pending changes in one window. Requires macOS 14 or later.
- Open Pahkui, switch to Format, and search for the extension you need from .avi.
- Select VLC. Use Choose another app if it is not listed.
- Review the pending association, click Apply changes, and confirm the new app in the macOS dialog.
The formats in this guide require Pahkui Pro, a one-time purchase for lifetime use. The manual Finder method does not require a purchase. See pricing
If the default app does not change
- If only one AVI fails while others play, test that file directly in VLC to separate decoding problems from default-app problems.
- A file ending in .avi.part is usually incomplete and has a different extension; finish the download first.
- If VLC is missing, confirm it is installed and can open the sample directly, then locate it with Other. If an extension is absent from the catalog, add the format in Pahkui. Changing an association does not add format support to the target app.
Common questions
Does changing the player improve video quality?
No. The association selects the player and does not restore detail or re-encode the original clip.
How do I restore the previous app for .avi?
Choose the previous app again in Finder or Pahkui and confirm the change. This updates the type association without deleting files. Use the Open With context menu for a one-time exception.