A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
I had this same issue with trying to open a CSV file.
What I found was that the path to the file was very long (along with a very long file name).
When I copied the file in Explorer to a directory that had a short path (e.g., C:\Temp), Excel opened it.
So I'm thinking that there is a Windows limitation to the length of path and file name.