Casper, I still get the Open/Save/Cancel dialog, which you also get with this code:

string fileName = @"Images\AG00011_.GIF";
string physicalPath = this.Server.MapPath(fileName);
Response.Clear();
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=\"" + HttpUtility.UrlEncode(fileName) + "\"");
Response.WriteFile(physicalPath);
Response.Flush();
Response.End();

NC...