trouble opening snapshots

Superlux
When I want to open some snapshots of saved webpages, Zotera can't open them in Firefox. It tells me that the snapshots are flash videos. So far, the only explanation for this malfunction I could figure out is that it's only with snapshots of which I changed the file name after saving.

(Mac user, Zotero 1.0.7, Firefox 3.0.2)

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