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How do i write a change password function for a paradox table

There is no way to do this within the Delphi VCL. Seems like a pretty serious omission to me. However, it is possible to do it by talking directly to the Borland Database Engine through the interface provided by the DBIPROCS and DBITYPES units. You call DbiDoRestructure, but set all the "number of" variables to zero, which makes it leave the existing values intact. I have code to do this, but it's a bit too long to included here. E-mail <graham@mhn.org> if you want it.