There is a utility program written just for this purpose in the downloads file #9955 Newclass it takes care of backup and is VERY handy for changing classes in class libraries and forms.

Glenn

>HI!
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>A program was made without subclassing, big mistake, I know. To correct this, I try to open the VCX as a table and to change the BASECLASS field of the object im interested, a Form. But this doesn't seem to work... Any idea on how can I achieve this work of substituting base classes? Thanks a lot...
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>An Michel R.