Problem using Launch when application is already open

[Martin Blackman]

Could someone please tell me how to open a file in an application
thats already open ?

eg using 'launch tfilename with (tOfficepath&"/Excel.exe")' does
nothing but sets the result to 'process already open' if Excel is
already open.

There is a twist - I can't just use 'launch document tfilename' as I'm
using office 2003 xml format which is by default opened with internet
explorer.

regards
Martin