There may be a noticeable pause between the loading of the picture and the start of the snow moving.
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The solution, for which I am grateful to Helen, of the Paint Shop Pro Users Group, was to slice the picture into 9 pieces. The frame was sliced into the four corners and the four sides, leaving the picture as the ninth portion. These were assembled in 3x3 table, and the alcsnow applet, with the centre picture embedded, placed in the centre cell of the middle row. The frame pieces were put in their appropriate cells.