>Some properties of system toolbars are saved in foxuser.dbf (Data field). I'd like to change some of them for example the title of the toolbar or tooltiptext property for buttons.
>
>My problem is that I don't know how to calculate a checksum value which is stored in the field chval. SYS(2007, Data) doesn't work in case of toolbars properties saved in Data field.
>
>Thanks.

I remember having read in some FP2.x manual (maybe as far as 2.0, while they still had the structure of foxuser explained) that the checksum is taken from sys(2007, subs(data,2)) or something like that - the first two bytes of the data memo field seem to keep its length. You better try to compare the values you're getting with actual values.