Thread:Project:Support desk/Upgrade to Windows 7 renders mime type unable to upload

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Hello, Recently desktops were upgraded from vista to windows 7. Nothing was changed on the server end. However, users attempting to upload files with extention ".oft" are met with

"File extension ".oft" does not match the detected MIME type of the file (text/plain)."

the oft was already in the LocalSettings

"Permitted file types: png, gif, jpg, jpeg, png, gif, jpg, jpeg, ppt, pdf, psd, mp3, xls, xlsx, swf, doc, docx, odt, odc, odp, odg, mpp, oft, msg, log, txt. "

There are no messages in the apache error logs. Tried browsers IE, firefox and chrome.

has anyone experienced anything likes this? Or please give me pointers on how to figure out what this might be.

Thanks m