Saleae logic analyzer, exporting data to .csv file
Since you did not bother to show the format of the data being presented to Excel we can only guess at what the problem could be. I can see two possibilities here. 


Put the data into a text file instead and then use Excel's very robust text file import wizard to perform the data import.
Write a pre-processing script on the PC in something like Perl, Python, C or even the VBA macro language available inside Excel to read in the data from the logic analyzer and convert it to a true .CSV format to that it will open directly in Excel.