Default Pop-Up Filename setting in "Save As" dialog box

[Thomas P. J. <Tom...@oc...>]

Hi,

I'm writing a module that's creating a file for downloading
by the user. I'm using a script that creates a 
MIME content-type header so the browser opens
a "Save As.." dialog box. This works fine.

One issue though: the filename that gets filled into the 
dialog box by default is the name of the script, eg "archive.cgi".

Also the file types the browser looks for is:   *.cgi

My questions are:
1) how does one provide an alternative name to appear 
    in this browser dialogue  eg "my-archive-file.xfg" ?
2) how does one make the browser look for  *.xfg ?

Thanks for any info.

/regards/tom