Hi Tim,
Please find a sample that uses ExcelRW and Calculate to resolve a reference between 2 excel files linked to below:
http://www.syncfusion.com/support/user/uploads/cs_usingformulasacrossworksheets.zip
The method of resolving the reference is very minimal and hardcoded at present because the reference appears as an invalid refernce when ExcelRW loads the file. I will submit feature requests for solving this problem and also building in the ability to recursively resolve foreign references into the ExcelRW library itself.
Thank you for your patience.
Regards,
Davis