I have defined a filepicker widget like this:
<input type="filepicker" data-fp-apikey="--" data-fp-mimetypes="image/jpg, image/jpeg, application/pdf" data-fp-container="modal" data-fp-multiple="true" onchange="on_file_picker_change(event,)" data-fp-button-text="Browse for files">
This is working fine on the Mac with Chrome, Safari and Firefox. It also works fine on Windows 8 with Firefox. However it isn't working on Windows 8 with IE10. Drag and drop doesn't work at all, and clicking on "Choose a file" bring up the file browser but the "Files of type" field is marked "Any File (undefinedundefinedundefined)", and choosing a file of the type my widget allows is not possible.
Any clues as to what the problem might be? I have not tested with other versions of IE.