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This supports the idea that in embryos from wild-type mothers, dpp H~- mutations cause the transformation of dorsal into ven-tral epidermis. If tissue determined to become dorsal epidermis dies in the dpp rim-null embryos, then one should not see ventral or lateral tissue formed in the double-mutant combination.
In the case that your DPP file doesn't open, it is highly likely that you do not have the correct software application installed on your PC to view or edit DPP file extensions. If your PC opens the DPP file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating DPP file extensions with the wrong software program.