Changing gp.ListRasters("*", "TIFF") to gp.ListRasters("*", "TIF") seems to have fixed the problem in some cases. Here is the code that seems to works every time in Python 2.4 :~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#import win32com.client, sys, string, os#gp = win32com.client.Dispatch("esriGeoprocessing.GPDispatch.1")import arcgisscripting, sysgp = arcgisscripting.create()gp.setproduct("arcinfo")gp.workspace = r"<a href="file:C:/TEMP" target="_blank">C:\TEMP</a>"# Get a list of grids in the workspace.rasters = gp.ListRasters("*", "TIF")raster = rasters.next()while raster: print raster raster = rasters.next()del gp~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~