Telling what a file is – whether plain text, Unicode UTF-8, 32-bit code, and so on – can be hard. Just use a little magic, free in the command tool ‘file’. Includes Swift code to access magic numbers.
QuickLook
Problems with a document thumbnail or preview? Here’s a neat command tool which can help you diagnose and solve them.
Preciziun can now open documents from their macOS Bookmarks, and preview them in Quick Look.
Single app now explores versions, lets you preview and manage them – all in one.
An important section of a document that you’re working has gone missing. Do you search back through backups, or use the versioning system to recover and replace it?
Check earlier versions by previewing them using Quick Look. This also fixes the bug which gave incorrect sizes for bundle documents such as RTFD.
Getting the best out of Quick Look’s document previews and thumbnail icons, in the Finder and the Open File dialog.
Finder revision class: two valuable enhancements for working with batches of items, to rename them, and display previews.
It may have become QTKit, but QuickTime is still going strong, and now 24 years old.
How can I check whether QuickLook should provide previews of various types of documents?
The Eclectic Light Company 