Problem

You have a Word 2000 document with pictures. The document size is is
perhaps 5 to 10 times the size of the document without pictures plus
the size of the pictures stored as for example .jpg files.

Solution

1. Open the document in Word (2000 in my case)

For each pictu

2. Select the picture, right click and choose edit picture
3. Now the edit picture window opens and you can only see the picture.
Select the picture and cut
4. Choose edit/paste special
5. Choose JPEG
6. You probably have to move the pasted picture to it's original
location
7. Close the edit picture Window and start from 2 with the next picture

When you have cut and pasted all your pictures: save and check the
document size