It is good practice to warn the user when clicking on a link is going to result in something other than a new web page being displayed.  Common examples of this include links to PDF (Adobe Acrobat) files, to Microsoft Word documents, to PostScript files, and so on.  Links to these files will result in the user being asked if they want to open or save the file, and depending on the file size, the application involved and the user's network connection, accessing the file may be a very time-consuming process.  It helps, therefore, if the link is distinguished with an icon to show what sort of file it points to, and a standard set of document icons is available as follows:-

Icon	Document type	Markup to include
	PDF file	<img border="0" alt="(PDF document)" src="/brands/icons/acrobat.gif" />
	Word document	<img border="0" alt="(Word document)" src="/brands/icons/word.gif" />
	Excel spreadsheet	<img border="0" alt="(Excel spreadsheet)" src="/brands/icons/excel.gif" />
	PowerPoint presentation	<img border="0" alt="(PowerPoint presentation)" src="/brands/icons/powerpoint.gif" />
	Access database	<img border="0" alt="(Access database)" src="/brands/icons/access.gif" />
	Visio document	<img border="0" alt="(Visio document)" src="/brands/icons/visio.gif" />
	Project document	<img border="0" alt="(Project document)" src="/brands/icons/project.gif" />
	Word 2007 document	<img border="0" alt="(Word 2007 document)" src="/brands/icons/word2007.gif" />
	Excel 2007 spreadsheet	<img border="0" alt="(Excel 2007 spreadsheet)" src="/brands/icons/excel2007.gif" />
	PowerPoint 2007 presentation	<img border="0" alt="(PowerPoint 2007 presentation)" src="/brands/icons/powerpoint2007.gif" />
	Access 2007 database	<img border="0" alt="(Access 2007 database)" src="/brands/icons/access2007.gif" />
	Visio 2007 document	<img border="0" alt="(Visio 2007 document)" src="/brands/icons/visio2007.gif" />
	Project 2007 document	<img border="0" alt="(Project 2007 document)" src="/brands/icons/project2007.gif" />
	Postscript file	<img border="0" alt="(Postscript file)" src="/brands/icons/ps.gif" />
	DVI file	<img border="0" alt="(DVI file)" src="/brands/icons/dvi.gif" />
	Text file	<img border="0" alt="(Text file)" src="/brands/icons/text.gif" />
	RTF file	<img border="0" alt="(RTF file)" src="/brands/icons/rtf.gif" />
	XML document	<img border="0" alt="(XML document)" src="/brands/icons/xml.gif" />
	Source code	<img border="0" alt="(Source code)" src="/brands/icons/source.gif" />
	Treeview or sitemap	<img border="0" alt="(Treeview)" src="/brands/icons/treeview.gif" />
	Image file	<img border="0" alt="Image file" src="/brands/icons/image.gif" />
	Video clip	<img border="0" alt="(Video clip)" src="/brands/icons/video.gif" />
	Audio clip	<img border="0" alt="(Audio clip)" src="/brands/icons/audio.gif" />
	Flash document	<img border="0" alt="(Flash file)" src="/brands/icons/flash.gif" />
	Viewlet	<img border="0" alt="(Viewlet)" src="/brands/icons/viewlet.gif" />
	Binary file	<img border="0" alt="(Binary file)" src="/brands/icons/binary.gif" />
	ZIP or other archive	<img border="0" alt="(ZIP archive)" src="/brands/icons/zip.gif" />
	OpenOffice Writer document	<img border="0" alt="(OpenOffice Writer document)" src="/brands/icons/oo-write.gif" />
	OpenOffice Draw document	<img border="0" alt="(OpenOffice Draw document)" src="/brands/icons/oo-draw.gif" />
	OpenOffice Calc spreadsheet	<img border="0" alt="(OpenOffice Calc spreadsheet)" src="/brands/icons/oo-calc.gif" />
	OpenOffice Impress presentation	<img border="0" alt="(OpenOffice Impress presentation)" src="/brands/icons/oo-impress.gif" />