susantos,It looks like you are going to have a long road ahead. An mxd is essentially a project that you then add data to, ArcGIS supports many file formats of data, see:http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Data_formats_supported_in_ArcGISTiff files are an ideal raster format for ArcGIS.RegardsAnthonyP.S. Please don't forget to mark posts as answered as this helps others using the forums. This can be done by marking the correct answer to your question as follows:[ATTACH=CONFIG]17614[/ATTACH]