vb如何引用photoshop

vb怎么引用photoshop
我在project-> references-> 添加Photoshop.dll时,它提示:can 't   add   a   reference   to   the   specified   file
怎么回事呀,要是引用不了,我就执行不了下面的代码:
Dim   appRef   As   New   Photoshop.Application
Dim   docRef   As   Photoshop.Document
Dim   selRef   As   Photoshop.Selection
Dim   strokeColor   As   Photoshop.SolidColor

我怀疑是不是要引用photoshop.dll这个控件
我是刚学VB的.
请高手指点呀

[解决办法]
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