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We are getting this in IE9:
SCRIPT87: Invalid argument.
lzma_worker.js, line 3582 character 13
(Our line number might be a off, we've been debugging a bit trying to fix it ourselves)
IE8 and other browsers work fine.
I fixed the invalid argument error (7fa8b2c); however, IE 9 throws additional errors.
Ok, let me know if you get it working.
It appears that IE9 recently added some functions that conflict with Web Workers. Should be fixed in cf2decb. I haven't updated the live demos yet.