COM interface and TIFF

I try to use the batch COM script with VBS. I 'm using the exemple script:
Convert2PDF.vbs.
That's working with any file type but not with tiff files.
It says "An error is occured: File is not printable!".

Does-it possible to make it working for tiff files?

Hi there, I am getting the same issue.  But I also get the same error when dragging into the GUI as well for .tif images.