Please check if your system's "Arial" font is active. For some reasons, the "Arial" font in a fresh (High) Sierra is "inactive" by default.
More information at https://discussions.apple.com/thread/8420562
You can ask questions and share your tips to improve iGEAK via iGEAK User Group: https://groups.google.com/forum/#!forum/igeak
I use the following simple solution (Windows-Excel 2016):
Open a new Excel window
Choose the Data tab
Choose the From Text option
Choose your *.csv file
Choose the Delimited radio box, then click Next
Choose Tab
Please check the following links for detailed information (2007, 2010, 2013, 2016)
You can retrieve only gene symbols using "=LEFT( A1, FIND( "__", A1)-1 )" function in your Excel or similar spreadsheet program. "A1" represent a cell having the original ID (i.e. geneSymbol__uniqueID).
Kwangmin Choi @ Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA