Language differences in server report and user report in SSRS

Hi,

My SSRS report's lanuage  property is set to 'English'.  the currency field in report  is formatted so that the value will display  something like this 393,7865.
 One of my user is in Germany and his computer is in german, when he exports the report  to excel the currency field takes the value in german format and display as 393.7865(  see the diiference. How do i handle this. can i use the language propery set up for this. What should be the value given for that.


Please help me.

Thanks,
San