How to get dsofile.dll to work with Excel 2007 to work on the backend side

[houston]

dear forum readers,

I have a web service that set custom properties to xls file and then
send out the file to recipients

I 'm now trying to get it to be able to set custom properties to .xlsb
(or .xlsm) files.

Heard that I could use dsofile.dll but I need to first install Office
Compatibility pack or the whole Office 2007 before it would work with
Excel 2007 files.

Problem is, the web service is running on a server and I can't simply
install things that. However, if I know that the exact libraries
required, I could just put the libraries in the /bin folder of my web
service.

Can somebody please tell me what are run time libraries that I need to
place in the /bin folder in order for dsofile.dll to work with Excel
2007 files ? Or is there a Excel2007 runtime environment that I can
install ?

Thanks a lot and have nice day ahead.

regards
Houston Shum