Incor****ating "old" clipart into 2003 Clip Gallery

I like a lot of the old (Office 97 & 2000) clipart images.  But my Office
XP 
does not seem to recognize them.  Is there any way to insert these
thousands 
of images into the Clip Gallery so I can include them when I search for 
clipart?  I have looked and looked and cannot seem to find any information
on 
doing this.

Thanks for your help.

Ann