I have created a interoplibrary to call excel methods (done via
references to Microsoft Excel 9.0, which created also the office and vbide
interoplibraries) and proceed then to create a Excel sheet. My problem is
that this works on two machines but on a third machine I get the error 'Old
format or invalid type library' when I execute the line
'app.SheetsInNewWorkbook' (for the code see below).
Can someone help me out, I'm completely stuck.

Thanks a lot in advance.