HttpHandlerFactory is not always called in IIS

[Guest]

Hi there, I meet with a strange behavior -- I add a custom httphandlerfactory
in web.config and map * to this new factory, <add path="*".... When I try it
in the build-in iis from VS2005, it catch all types of URL that I passed in
from the address bar ,including .aspx, .ascx, .master... But, when I do the
same thing thru the windows IIS service, only .aspx get pass to my handler
factory , not the rest.

I confirm the setting in IIS, all file types are mapped to aspnet_isapi.dll.
Does anyone here know the reason?

Thanks for any comment.