Need help with Virtual CD driver

[doctorT]

I use Microsoft's driver vcdrom.sys to create a virtual cd drive. The calling with DeviceIOControl succeeds but the device appears in the openRequester window from every program (PB, Word, etc) from File->Open but nowhere else. What else sould be done to appear in My Computer too? The same driver used by a C++ application makes virtual drives that appear in My Computer, so something else must be called in order to appear there too, but what is it? It is not something in the driver but what is it? DefineDosDevice used as: DefineDosDevice_(0,"Z:","Z:") didn't make any change. (Z is the letter of the drive created.)