Hi Jeff, I created a MapDocument with the 10 PreRelease Version and successfully exported it as a 9.3 Version. >>> mxd = MAP.MapDocument(r'C:\Data\Mxd10.mxd') >>> mxd.saveACopy(r'C:\Data\Mxd10output.mxd',"9.3") But, if I try to open the same MapDocument in Desktop 9.3.1, I get following error: "Opening the selected ArcMap document failed. An unexpected error occured.... This map document was saved using a newer version of ArcGIS." In addition I have tried the same steps with a LayerFile, created with the PreRelease (10.0), but I get the same runtime error Guenther has already posted: >>> layer = MAP.Layer(r'C:\Data\layer10.lyr') >>> layer.saveACopy(r'C:\Data\layer10test.lyr','9.3') Runtime error <type 'exceptions.TypeError'>: function takes exactly 1 argument (2 given) It seems to be a bug in the PreRelease. Could you tell me, if this issue will be solved with the Final Release? Thanks, Kathrin
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