Recognize a PDF file in 'mouse over' album view

[planalp]

There was recently implemented ticket #399-More information in album view. Sometimes there is additional information about an album such as images of scanned liner notes that you get when you purchase the whole album as a download. This data could be easily accessed if the mouse over album view would include it as a link, as it does now for all the songs in the album. PDF files are a versatile way to hold the data, so the request is that the system recognize those.