Ferrari Mailing List: NFC: Opening scr file?

[Tom Reynolds (kjtar]

I have 15 .jpg images made up into a screensaver file.  How do I open the 
screensaver file to substitute one .jpg file (unretouched) for the new, 
improved (retouched) version?  I have Adobe Photoshop and Irfanview,
Windows98.  I can find the screensaver (.scr) file (Windows/System) but I don't 
know how to make the individual .jpg images within it accessible so that
I can replace one with the other.
?
Thanks,
Tom Reynolds
Tulsa, OK