>>Of course, in VFP6 no way to call Release() directly. So we need to find a function for releasing of object. I wanted to play with ReleaseStgMedium() and *pUnkForRelease member in STGMEDIUM structure. I found also a function (forgot it's name), which requires another interface, but calls Release() in all cases, even when a passed interface of wrong type. But I haven't tryed it so far.
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>Please keep me up-to-date on this.

I have got two new ideas. First is UlRelease() function in mapi32.dll. The second is VariantClear() in oleaut32.dll with VT_DISPATCH variant type. Last way seems to be the most appropriate.