I was having trouble with this plugin working properly in IE 6 & 7 with Quicktime, so I wrote a post to the developers forum. The reply I got back was: "Clyde: QuickTime embedding is buggy, at best. Not much I can do, sorry." When I remarked about the helpfulness of that response I got another response that include the phrase: "So yeah, f..k off Clyde." SO I would not recommend this plugin or any of the Vipers other as well, cause if you have a problem you might just have to "F..k off"!!
I am in the process of switching my site to Yaosan Yeo's Quicktime Embeded plugin which seems to be working much better!!