Replaced part in dwg with SW Explorer, but looking for file on open

I replaced a part in a drawing thru SW Explorer. SW Exp shows that the part I want is linked to the drawing. However, when I open the drawing, in SW, it pops up the "Open" dialog box looking for the part? It is looking for the correct part name, and the part is right there, where it should be.

Have I misunderstood the purpose of SW Exp? I had thought this was one of it's purposes.....

It has been a challenging SW day.

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