Has this happened to you? You drag a document onto an application icon. And nothing happens. The icon does not go dark. The application doesn't launch and load the data. But you know that it should; it just won't. Fortunately, OS X allows you to force an application to try and open that file. By holding Command+Option while dragging, you tell OS X applications to open files regardless of whether they "support" that file type. For example, you can Command+Option drag a C or Ruby source onto Safari and open that source code in a new browser window. Or you can Command+Option drag a tab-delimited text filed onto Excel. It's a very convenient work-around.