It depends on the application. Some allow both methods and have it in
their options or preferences, some only allow one method.
It looks like Foxit has only one method and that is to open a new
instance, unless you open the second file from a running instance of
Foxit.

You might try asking at the Foxit forum if there is any way to do it.
http://www.foxitsoftware.com/bbs/

....Alan
--
Alan Edwards, MS MVP W95/98 Systems
http://dts-l.org/index.html

On Mon, 15 Aug 2005 18:00:13 +1000, Franc Zabkar
wrote:

If I have already launched a particular application by clicking an
associated file type, how do I prevent a second instance of this
application being launched when I click on a second file of the same
type? For example, I have just switched from Adobe's Acrobat Reader to
Foxit's PDF reader. Clicking on a second PDF file opens a second
Acrobat window, whereas in Foxit's case it launches a second copy of
the reader.


- Franc Zabkar