If you are like me, every day still have to deal with office 2003 or 2007, then you will surely come across this. Some time the user complaints that it takes long time to open up a file, however it opens up perfectly fine with the guy sitting next to him… not happy user.
Give this a try if you care, this work for me. The Microsoft article here http://technet.microsoft.com/en-us/library/gg985445%28office.12%29.aspx
In summary, the office file validation is taking a long time to wait for validating the file, sometime it will even fail or time out. If you are confident that the files they used are always from valid source, then just apply this registry hack to disable the validation. Once disabled, the problematic files will open up fine.
keep the user happy.