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Error in Powerpoint: QuickTime and a TIFF (LZW) decompressor are required to view this image - in place of images

Opened in OpenOffice Impress, the images in this presentation are replaced with
QuickTime and a TIFF (LZW) decompressor are required to view this image. MS Office 2007 gives a similar error. I need to either extract the images or be able to view the presentation.

openwetware.org/images/0/08/SB-Lecture1.ppt
openwetware.org/images/e/e4/SB-Lecture2.ppt

QuickTime is installed, Web searches say this is a common error; all ppt files made on a mac by "dragging and dropping them into the editor" end up compressed in a way that windows cant open them; these files supposedly work on a mac. The advice usually given is to open the files on a mac and save them.

I don't have access to a Mac, only PC (Windows or Linux). It ought to be possible, after all, the information is in the files if they can be viewed on a mac... how hard can it be to dump out the image data? I haven't found a tool for the purpose though.

Update:
It has been suggested I use the VBA code at
http://www.pptfaq.com/FAQ00534.htm
to export all images from the presentation.

That code runs (in powerpoint 2007) and it does create several .png image files, but they're just "QuickTime and a TIFF (LZW) decompressor are required to view this image" on a white background in PNG format.


The business end of the program linked to seems to be the line
oSh.Export sImageName, ppShapeFormatPNG
which is executed on 'shape' objects in the presentation's slides.

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