Hi there, I'm studying an IT course and I've spent the last 2-3 hours trying to figure out what the answer for this is and I am really incredibly stuck, would somebody please be able to help me or even give me a hint in the right direction?

The question is

Henry Smith from another branch has sent Anna Chong a PowerPoint presentation via e-mail. She can open and read all the data in the document, but she cannot edit an Excel spreadsheet object that has been included in the presentation. When she tries, she gets an error message saying that the server application, source file or item cannot be found. Excel is definitely installed on Anna's PC.

a) Explain why Anna can't edit the data

I'm almost positive that the assignment wants me to research the answer on the Internet but I've been searching and searching and I can't seem to find a solution, if nobody can give me the answer could you atleast tell me what I should be googling? Because I have to provide atleast two resources I used to find the solution and I kind of think I know the answer but I can't find any resources to put into my assignment (assuming it is the correct answer).

Help would be very much appreciated, thanks in advance.