Hello, I just compiled gdal with VC71 and MrSid DSDK 3.2.1 I sent the neccessary changes to Frank. Now I wanted to test it with test_ogrsf I got the message: Unable to open datasource ... with the following drivers. ..... What must I do to get test_ogrsf to use the driver. test_ogrsf was linked with the MrSid lib's. Cheers, Bjoern Bjoern Ruff br at forstware.de