Directly - no. In ArcGIS 10, use the "Create File GDB" geoprocessing tool to create a 9.3 schema file geodatabase. In the Catalog 10.0 window (or ArcCatalog 10.0), drag/drop features classes from your 10.0 geodatabase to the 9.3 geodatabase. Then open a blank ArcMap 9.3 document and point to the 9.3 geodatabase feature class data.
Good luck!
Robert LeClair
Esri-Denver