File extensions, those bits of text that follow a period at the end. Back in the pre-Mac OS X and macOS days, Apple’s System 9 and earlier relied on hidden metadata to associate files with apps.Cnf file extension is used for Network configuration data.
App file extension is used for Mac application package or core system service.
However, there is a way how you can change default app for all files with no file extension found on your Mac. A file’s filename extension shows what type of file it is and what apps can open it. A filename extension appears at the end of some filenames, and looks like a period followed by a few letters or words (for example.jpg). Set the Default Application for a Specific File in Mac OS X: This provides file-specific control over. If you need to open that file with another app though, you can right-click on the file, choose Open With and then choose another app from the available ones in the list.īut what if you want to have not just that one, but all other files of the same format to be opened with an application other than the default one? However, double clicking on the file will open it in that application and that one alone. Whenever you download or create any given file on your Mac, it is instantly assigned a default application to open it, which you can easily identify by the file’s thumbnail in most occasions.