olefield
is a Python module for poor souls who need to extract data out of Microsoft Access database OLE object fields.
You can use it to extract BMP images:
>>> import olefield
>>> ole_content = '...' # you have to load oleobject field data somehow ;-)
>>> n = 1
>>> for bmp in olefield.bmps(ole_content):
... open('%d.bmp' % n, 'wb').write(bmp)
... n += 1
If the above fails or you need to extract something else (beside BMP), try lower level API:
>>> for object_type, data in olefield.objects(ole_content):
... print '%r %d bytes: %r' % object_type, len(data), data[:30]
Then send me an email telling me what you get ;-)
I have only tested olefield
with Microsoft Access 2007.