As been discussed in the ChatterBox, this fails in MSIE 5.5 on Windows. The reason, as derived from the error message, is that MSIE apparently specifies the full local file path as the filename. My bet is that Image::Magick on the server side cannot properly process a file with such a name.

A possible solution, but untested at this time because I can't get Image::Magick to install even though the ImageMagick command line tools work, would be to use the tmpFileName method from CGI.pm, to get at the name of the temporary file for the upload. See the docs on CGI.pm, search for the text "tmpFileName". It doesn't appear to have a separate entry.

If all this still fails, you can always try and copy the tempfile from the handle to your own temporary file, using functions available in File::Copy, so you get a filename that Image::Magick can work wirh.