When you create a custom file type, you'll have to specify the property values so that your file type is recognized by the OS. For an example on how to use custom file types in your apps, refer to the Using File Type Groups section. These are files that your app creates and knows how to handle. For an example on how to use common file types in your apps, refer to the Using File Type Group section.Ĭommon file types should always have their UTI type set to 'Imported'.Ĭustom file types are used for files that are owned (or created) by your app. Generally you should not change any of the settings for a common file type. When you choose a common file type, it is added to the File Type Group with the correct properties filled in for you. These are file types for standard file formats, such as mp3, text, png, etc. With the cursor in any field of the File Type, click the X button to remove it. Use the buttons in the File Type Group editor command bar to add a custom File Type or add a Common File Type (file types for standard file formats). To create a File Type Group, select Insert ↠ File Type Group from the toolbar or main menu.

What you specify in your File Type Group is used to tell the OS how your apps deals with files. It also abstracts your code from the operating system, making it easier for you to create versions of your app for other operating systems. This allows you to work with names you can choose and easily remember instead of cryptic codes. Each file type has a name that is used in your code when opening and creating files.

A File Type Group contains one or more file types that represents a specific file type and contains information on how to identify the file. Rather than writing code that deals directly with all of this, you create File Types Sets to abstract you from the details. A file named 'MyNotes.txt' is recognized as a Text file. For example, a Text file has the extension 'txt'. Files have a file extension (or suffix) that defines the file type. For example, a text file stores text while a PNG file stores PNG images. The type of a file defines a unique type of data stored in that file. This File Type Group Editor is available starting with 2015r3. You do all these things by creating File Type Groups with the File Type Group editor. Apps may also want to create their own files, with specific icons for files used by the app. Your desktop apps may need to prompt users to select files.

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