One of the most visible changes in Windows 7 has been its elegantly designed and very useful taskbar, which can even be further tweaked using Taskbar Thumbnail Resizer or the Windows Taskbar Thumbnail Customizer.
Open a file by drag-and-dropping it onto the Taskbar
The Windows taskbar allows you to use the drag and drop method to pin any program to it.
But when you drag a file onto any taskbar icon, it will get pinned to that program.
Now if you wish to open a file with a particular program, simply press Shift key and then drag and drop the file onto the program icon. Thats it!
For instance, if you wish to open/play a MP3 file with Windows Media Player, hold down Shift key and then drag and drop the file onto the WMP icon!
Windows Media Player will open and start playing the media file!