Yes Excel gives "not in a recognizable format" message.
VFP gives is not a table.

>I think it's clipper, have you tried to open the file in Excel with DBASEIV?
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>>I need to import some data from an unknown DOS base program. I'm trying to find out how to open and read these tables. The data file extensions are 400 and 410. In the program folder you see some files with *.NDX, .NDH. Can you tell me what type of database is used to create these files?