Could be the memderdata property. If it is filled then the form will not work in any version before 9. This goes for each object on the form as well, Anchor property and all such new things.

Like you can't use CursorAdapters in VFP7 because they were not there in that version. Only option is to open the form as a table and check the properties, deleting any that are V8 or V9 specific.

>I am trying to work with some forms by Andy Kramek from Southwest Fox 2005 where he presented an updated version of his DataClass that was originally published in "MegaFox".
>
>My problem is if I run the demo from SWfox2005 in VFP7 I get the 1744 error. If I move Andy's new classes into the MegaFox project and run it from VFP7 I get the same error.
>
>Obviously the new classes break something in the form but what I don't understand is why do the SWFox2005 forms break when they run in VFP7?
>
>I am not asking for a debug, what I am trying to understand is what changed between VFP7 and VFP9 that makes it so new forms can't go back? Was the change in VFP8 or VFP9?
>
>Thank you.
>
>Margaret