ILMerge is a tool available for download at
http://www.microsoft.com/downloads/details.aspx?FamilyID=22914587-b4ad-4eae-87cf-b14ae6a939b0&displaylang=en
One use of the tool is described at http://jasonhaley.com/blog/archive/2007/04/05/138404.aspx
The basic sequence (as outlined in the article):
ILMerge WinJournal.exe WinJournal.Register.dll /out:WinJournal2.exe
(Any number of sources can be specified.)
ildasm WinJournal2.exe /source /out:WinJournal2.il
(This breaks the exe into IL code.)
One of the most common formats to get data exported from other systems in is the CSV (comma separated values) format. A good starting point for this pseudo standard is found here: Wikipedia on CSV. As this format is not published by any standards body, you may find some files are easier to open than others. However, most spreadsheets can open the format and massage the data as needed.