Ok the one workaround I can think of is to create a folder somewhere, and place a shortcut to your file in it Right click the taskbar and select toolbar - New Toolbar - navigate to your folder and select it.
This will create a new toolbar entry on the taskbar - right clicking will allow you to turn off the Title and Filename Display and set the display to large icons - this is a complex way but will give you a direct link to your file
You can use this method to place more than one shortcut on the taskbar, just unlock the taskbar and adjust the width to your requirements, any shortcuts that will not display will be available as a pop-up
The above image shows a toolbar that contains a single PDF file,2nd icon from left, ( the recycle bin is also placed here by the same method, it's live and saves closing windows to reach the normal one on the desktop)
a nice step by step for the Recycle bin is Here
just change the recycle bin for your icon in the instructions