ABBU is the native file type for the Mac OS X Address Book, which means that you can only open ABBU files using the Mac Address Book application. However, you can use the iWork Numbers application to ...

There are dozens of file formats for word processing documents, database files, graphics, spreadsheets and so on. If a file was created in one application and you want to use it in another, you can ...

A CSV (comma-separated values) file is a text file in which information is separated by commas. CSV files are most commonly encountered in spreadsheets and databases. You can use a CSV file to move ...