I'm creating thumbnails for a variety of Office documents but not all of them are converting. The documents are a mix of Word, Excel and Powerpoint files. In most cases the error occurs when I call the respective thumbnail creation method. I have about 80 failures out of a total of 4500 documents.
Are there content restrictions for each file type, and if so what are they?
I've attached an example of both a Word document and Excel spreadsheet that fail to convert.