Hi,
We are using Assembly  Infragistics35.WebUI.Excel.v9.1  with asp.net. 
We use HYPERLINK formula:

cell.ApplyFormula(@"=HYPERLINK(A5" + @",""" + "file" + @""")");

It's fine but when the url exceeds the maximum length  (255 characteres) appears #VALUE!

Did you get any solution for this?

Thanks in advance!