Need to write .dll

For All,
if winzip is intalled on our system and when we right click on root
drive c:, d: etc. when select “add to zip” a exe file run.

same as it, i want a VC++ application dialog appear when i
click on “attach” option. so how the attach option can appear or added to
already menu list when i right click on Drive letter. before it develop
Virtual CD Driver. i want to add new option that should be appear just
with virtual CD devices. is there need to write dll or oa modify the
driver. i dont have any idea how i can do this.

with regard
Naushahi