When I load a CSV file using Excel.Open() in which one of the cells contains just a hyphen ("-"), I get a FormatException. Apparently it's treating this like a negative sign and expecting that digits will follow, however I want it be treated just as text. I can load the CSV file in MS Excel no problem (it doesn't show a #VALUE or anything like that). I don't want to have to search through the file and check all columns before loading it.
You can reproduce this error by loading a file that has just a single hyphen as the entire file contents.