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UTIutility

How does macOS tell the type of a file?

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How does the Finder know the right app to open a file with? Or QuickLook how to preview its contents? Or other services like Spotlight know how to index and handle files? UTIs.

December 24, 2022 Macs, Technology, Updates

Explainer: file types

Many think that a file’s type is determined by its extension. Although partly true, that’s indirect: it’s the UTI which sets the type, as explained here.

October 16, 2021 Macs, Technology

UTIutility version 1.1 is now a Universal App

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Explore UTIs, MIME and file types, extensions, and more. Now runs native on Intel and Apple Silicon Macs.

August 22, 2020 Macs, Technology, Updates

What’s that file then? How to identify unknown file types

You’re checking through old files. How can you tell which file type they are when you don’t recognise the extension, or they don’t even have that to help?

September 21, 2019 Macs, Technology

What are those Us? A journey with UTIutility version 1.0

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What’s a UUID, and a UTI? What can you learn from each, and where can you look them up? Important info about these, and a new release of a tool to help.

May 30, 2019 Macs, Technology

UTIutility Support

This page is for your support questions and comments on my free app UTIutility, a live reference on […]

May 27, 2019 Macs, Technology

Finding and converting legacy media 1: still images

Later this year, in macOS 10.15, one of the media types which will become unsupported is JPEG 2000 still images. Here’s how to find and convert your old images.

March 26, 2019 Macs, Technology

Why can’t I open that document? Troubleshooting LaunchServices

You try to open a document – in this case, one of Firefox’s bookmarks – and nothing happens. What could be wrong? It turns out it’s a bug, of course. But where?

January 28, 2019 Macs, Technology

Missing types of files: the bug in UTIs

An old bug in UTIs can cause problems for apps, and may even crash them. The issue is that macOS can’t always tell what type of object certain ‘files’ are.

January 22, 2019 Macs, Technology

Bailiff (iCloud), Taccy (privacy access) and UTIutility (UTIs) are notarized

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Each now built with the latest version of Xcode, and notarized for your added security. Recommended for Mojave users in particular.

November 16, 2018 Macs, Technology

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