I am using a lot of csv files at work with excel 2010. These have no formatting so Excel 2010 autoformats all the cells. I've found workarounds but the ones I have found require action for each file or each cell (i.e. adding a single quote).
My current workaround is using the "show formulas" option under formula auditing in the formulas tab. This seems to show the raw data (since they are just csv files there aren't formulas). If I could just keep this active so I don't have to turn it on.