>sorry,I have something wrong in my first letter. the dbf file and its' cdx file are built in C language file. several years ago,we use C file to send data into dbf file and we use foxpro 2.5 application system to query the data. In foxpro 2.5, it opens the dbf and cdx file fine and works very well. today, we want to use visual foxpro 3.0 to update the application system. we open the dbf file fine but when I use 'set order to tag key1_tag' it cause an error 'Variable 'key1_tag' is not found''. I don't
>know what happened.
> I create a dbf file in vfp 3.0 and try to open it in foxpro 2.5,but it
>can't be open! this must have some relations to my current problem.
> In C language file, it is only a system function to create the dbf and cdx file. I think it is difficult to modify the C language file. What can I do?
> How to solve the problem?
>
>Thank&Regards

If you really do so, you must have problem in opening dbf files because the file structure of VFP3's tables are different from VFP2.5. VFP3 support true database concept and long field name, so if you want to use VFP2.5 to open VFP3's table, the VFP3's table must be created in free table mode.

Did you use C or VC++ to create your dbf and cdx file? Please give me details.

Sunny