Found a workaround for the MSIE cache bug that puts brackets around dotted items I posted about a while back (e.g. "somefile1.0-xyz.zip" becoming "somefile[1][0]-xyz.zip").
It turns out if you encode all but the last dot as %2e, then MSIE won't do this. If you encode all of them (including the last dot), then MSIE sticks an extra bracketed number at the end of the file (e.g. "somefile1.0-xyz.zip[1]"). Unfortunately, however, some other browsers then want to save the file with the %2e in the filename instead of the dots.
if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE"))
{
$fileName = preg_replace('/\./', '%2e', $fileName,
substr_count($fileName, '.') - 1);
}
Viola. Properly named files. This works at least with MSIE 6.0.
