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Surely win98se can bring up a dos prompt?
What I do:
1. My avi's are located in \capture\images (for example)
2. ppmcentre is located in \capture
3. I create sub directories for the set of bmp's for each avi. eg: \capture\images\jup1bmp, \capture\images\jup2bmp
4. I use virtualdub to save the avi as a set of bmp's into each subdirectory. Before saving, I delete the obviously bad frames that were out of the FOV or blurry due to bad seeing or scope movement.
5. Go to dos prompt
6. cd \capture
7. ppmcentre -width=400 -height=400 images\jup1bmp
8. repeat for the other bmp directories
The benefit of using ppmcentre, even if your tracking is fairly accurate, is that it can speed up processing time in registax because each frame is only 400x400 (instead of 640x480) so it processes them quicker. It also seems to align quicker with the object in the centre of each frame. Obviously 400x400 is fine for the planets where they are normally smaller than that. Those with large image scales might need to adjust.
Also when doing the moon, I skip this ppmcentre step completely as it doesn't make sense.
9. Open registax
10. Using windows explorer, drag the set of bmp's into registax
HTH
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