Moving a subsite

Hi

I want to move a sub site from one department to another following a restructure.

Using command below fails

stsadm -o export -url http://sharepoint/sites/Procurement/Facilities/ -filename E:\export -versions 4 -cabsize 512 –nofilecompression -includeusersecurity

Removing the -nofilecompression it then works, after digging around found "filename : Name of the export file.If using the –nofilecompression parameter, a directory must be specified; otherwise, any file format is valid"

Might be being stupid but i am specifying a directory and so at a loss why it fails?

Thanks