We're upgrading our solution/project to v13.1 (I know, I know... one step at a time) from v11.2.
In our previous version, we referenced assemblies such as Infragistics3.Documents.Excel.v11.2.dll and Infragistics3.Win.UltraWinGrid.ExcelExport.v11.2.dll. These don't seem to have matching equivalents in v13.1.
So - what to do?
Hello ,
Since Infragistics 12.2 all of Infragistics assemblies for Windows Forms are compiled against .NET 4.0 and their name are changed to Infragisitcs4.
http://help.infragistics.com/doc/WinForms/2014.2/CLR4.0/?page=Win_Breaking_Changes_in_2012_Volume_2.html
so you should replace your Infragistics3.Win.UltraWinGrid.ExcelExport.v11.2.dll with Infragistics4.Win.UltraWinGrid.ExcelExport.v13.1.dll and etc.
Please let me know if you have any further questions.