SQL Server Integration Services has its own high-performance file format for persisting data - it's the "raw file." The downside of these files is that they can only be used from within an SSIS data flow - there is no other tool to open them.
Or is there?
Simon Sabin has developed a "Raw File Viewer" and has made it available for a free download - check it out here: http://sqlblogcasts.com/blogs/simons/archive/2007/01/11/SSIS-Rawfile-viewer---now-available.aspx
Yes, I realize that this is really old news as he posted this back in January (and it is now November) but as it has managed to slip under my radar for the last eleven months I figure that I'm not the only one who has missed it...