[gears-users] cannot create a BlobBuilder in IEMobile 6

[Nemisis]

We are creating an offline application that allows a user to choose
files on there mobile device and it is then stored in the local sqlite
database using gears.

This seems to work fine in a desktop browser (firefox) but not on the
IEMobile emulator.  As soon as i create the blobbuilder it generates a
javascript error.

Here is the code.

<input type='button' value='add files...' onclick='dom.chooseFiles
();' />

    function chooseFiles() {
        alert('chooseFiles called BB 56');
        var blobBuilder = google.gears.factory.create
('beta.blobbuilder'); // THIS LINE CAUSES ERROR

        alert('after builder created');
    }

Can anyone shed any light on this?