PPT: Improved access to image names.
* It seems to be normal for MS Office 2003 that the MD4 digest of a BLIP (specifies the unique identifier of the pixel data in the BLIP) in blipStore and OfficeArtDggContainer DOES NOT match. This means that we can't locate the picture for a Picture Shape in the blipStore b y its MD4 digest. * Using stream offsets to locate the picture. * Re-save in MS Office 2007 updates the MD4 digests in OfficeArtDggContainer. Tests showed that MD4 digests in blipStore were always up2date. BUG:247633