No, there is no way to change it to the custom extensions, however it kind of possible to use other VFP extensions like that represent the index of memo files, like .VCT, .SCT, .FRT, etc. I wrote a message about that some time ago but can't find it now. But that's probably not what you want.

>Hi all,
>I can change the extensions of my tables (.dbf) to any other extensions without problems. For example:
>
>USE mytable.xyz
>
>but the associated files must have the standard extensions (.cdx, .fpt).
>It's possible to change this?.
>
>Thanks in advance.
>-Daniel