win2000/XP:
Windows Explorer --> tools --> folder options --> file types
select avi or whatever you want
--> advanced --> change icon --> browse
it's almost the same for win98 (and Me and old NT I think) except folder options are accessed thru the 'view' menu if I remember correctly and you must choose by filetype (selection by extension is not available) and it was not an 'advanced' button but 'edit' or something like that
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