Have a look in the Registry.
(Start-Run-Regedit)
Navigate down to
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths
I don't have either application but I suspect Firefox has an entry
there and Opera does not.
...Alan

Signature
Alan Edwards, MS MVP W95/98 Systems
http://dts-l.org/index.html
In microsoft.public.win98.performance, jrp@nospambellsouth.net wrote:
>Win98SE
>Firefox 1.0.4
[quoted text clipped - 7 lines]
>
>Opera will not. But requires a complete statement of PATH.
(snip)
>Why does one start pathless, and the other does not?
jrp@nospambellsouth.net - 14 May 2005 13:26 GMT
>Have a look in the Registry.
>(Start-Run-Regedit)
[quoted text clipped - 4 lines]
>
>...Alan
Excellent and rapid answer Alan. I looked and you are correct. And if
there was an actual need, I could create a key and values for Opera that is
a mimic of the firefox key/values.
(I noticed this when i was batching these two)
jrp