Custom Context Menus (Open With) in macOS

There are several ways to register custom context menus ("Open With" options) in macOS.

Method 1: Using Launch Services

This method uses macOS's built-in Launch Services feature:

Open System Preferences
Go to Keyboard > Shortcuts > Services
Create a new service in Automator

Method 2: Using an Application Bundle

To register a custom application in the "Open With" menu, you need to create a proper application bundle with an Info.plist file.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>CFBundleDocumentTypes</key>
    <array>
        <dict>
            <key>CFBundleTypeExtensions</key>
            <array>
                <string>txt</string>
                <string>md</string>
            </array>
            <key>CFBundleTypeName</key>
            <string>Text Document</string>
            <key>CFBundleTypeRole</key>
            <string>Editor</string>
        </dict>
    </array>
    <key>CFBundleIdentifier</key>
    <string>com.yourcompany.yourapp</string>
    <key>CFBundleName</key>
    <string>YourApp</string>
    <key>CFBundlePackageType</key>
    <string>APPL</string>
    <key>CFBundleShortVersionString</key>
    <string>1.0</string>
    <key>CFBundleVersion</key>
    <string>1</string>
</dict>
</plist>

Method 3: Using UTIs (Uniform Type Identifiers)

You can also register UTIs for your application to handle specific file types. Here's an example in Swift:

import UniformTypeIdentifiers

class DocumentHandler: NSObject, UTIDocumentProvider {
    func document(withContentsOfURL url: URL,
                  typeUti: String) throws -> AnyObject {
        // Handle the document here
        return NSString()
    }
}

Method 4: Using `defaults` Command

You can use the defaults command-line tool to associate file types with applications:

# Associate .txt files with your app
defaults write com.apple.TextEdit LSHandlers -txt
your.app.bundle.identifier

Best Practices

Always provide clear file type associations in your Info.plist
Use unique bundle identifiers
Provide appropriate icons for your file types
Implement proper error handling
Test your implementation thoroughly

Useful Tools

Xcode - For creating application bundles
Automator - For creating simple services
lstype command - For inspecting UTIs
defaults command - For managing file associations

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