If you are an Office 2003 user who has recently installed Service Pack 3 who has found it necessary to open up file formats from the pre-Office '97 era, you may have noticed that Office now blocks access to these file formats. According to Microsoft, older Word, Excel, Lotus 1-2-3/Quattro and Corel Draw files are affected, because "...By default, these file formats are blocked because they are less secure. They may pose a risk to you." This isn't pure FUD, as Larry Seltzer points out, file parsing is an easy way for miscreants to attack computers using malformed data files. So rather than patch the holes for these, let's face it, ancient file formats, Microsoft has decided to just disable default access. Yeah, it's lazy - but we kind of don't blame them (even in the corporate or academic environment, when was the last time you access a document created in one of these formats?).

For users who really need to access that old data, Microsoft's Support Site has posted instructions on how to modify the registry so that your program(s) can access the old files. This can be done manually or by running a pre-configured registry script.

Conversely, OpenOffice can be used to open the old file types. In any event, we highly recommend converting your old files to a new format anyway -- it really is more secure (and will help guarantee compatibility with future Office suites by Microsoft or someone else).