Here you find a few icons for different file types. They are roughly inspired by the Tango Icon Theme Guidelines and thus can be nicely combined with other Tango icons.
The different kinds of files (program, document, movie, archive, image, sound) are represented by different forms of the icons (window, sheet, film stripe, package, photo, sound waves), the different file formats are denoted through colours and their typical file extension. This way, people can see the type of a file without knowing the icon, which is important if the icons are used on websites, where users don’t have time to get used to the icons but have to recognize the different formats straight from the first look..
The set consists of 34 icons for most of the common file formats you usually find on the web (while proprietary formats like DOC, XLS or PPT with equivalent free alternatives have intentionally been omitted as they souldn’t be used on the web).
16x16
20x20
48x48