I am trying to figure out files in the USGS data download section. DLG files 100k scale. The files with names like (1431479_TR_sdts_tar.gz) . . . no problem. But what do I do with a file that has (opt) in the name? Example, in the 100k California Stockton folder under transportation there is a large file, I know what that one is and how to unzip it. But there are several other files that break down transportation into categories, which would be more convenient. These have names like, 528163_RR_opt.gz. I just need to know how to unlock them. Second problem, I have noticed that several of the line files, versus the polygon files, seem to be unstable or corrupt when trying to use them in MapInfo. I don't know if the main file is corrupt or if it becomes corrupt after running it through the sdts2mi program. Anyone else notice this problem? Regards, Glenn Nevill [EMAIL PROTECTED] 415 768-7340 ---------------------------------------------------------------------- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]