Did you ever get an Excel, .XLS, file in a weird format? Something like this:
4 0 obj
/DecodeParms <</Columns 1656 /Rows 2339>>
The reason is most likely that it is not an Excel file — it’s a PDF file named XLS! Rename the file to .PDF instead, open it in Adobe Reader or a similar PDF reader, and, hey presto, there you go.