I have developed an Addin for Word and it has installed and worked on every machine I have put it on, except one.
The message I get is: 'Dllname.dll is not a valid Office Addin' when I try to 'Add' the dll to the COM Addins dialog in Word.
Where dllname.dll is the actual name of the DLL.
Has anybody had this problem and solved it? There are a lot of points on this because it is v. urgent.