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Difference between comdlg32.ocx and comdlg32.dll

Posted on 2010-03-31
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I see both the comdlg32.ocx and the comdlg32.dll in Windows\system32 directory and was wondering what the difference of these files are.  I know the .ocx is ActiveX, but why both files with the same name...do they provide different functions to use.  This is not the only example either,  there is mscomctl.ocx and .dll.  Is there a common approach to these files having both a .ocx and .dll?

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Question by:GoPack
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John Hurst earned 2000 total points
ID: 29259240
A DLL is a library file, whereas an OCX is an active X control as you noted. An active X control can use a library (which is why you see both). A library is not an active X control, so you need the other. No conflict and no problem - it is the way it was designed. ... Thinkpads_User
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by:GoPack
ID: 29261051
Thanks Thinkpads_User, so if I understand this right...The .ocx file is like a .exe with a .dll.  The ActiveX control (comdlg32.ocx) calls the dll (comdlg32.dll) just like any other .exe?  And in the ActiveX situation, most likely a .exe calls the comdlg32.ocx which then calls the comdlg32.dll for the function.?

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by:John Hurst
John Hurst earned 2000 total points
ID: 29265054
I don't think you can be overly strict in this description. An Active X control needs an OCX to run. Something will run the OCX because it is not an EXE all by itself. Now whether an OCX calls a DLL - that would be up to the programmer. However, the way you described above is very likely correct. ... Thinkpads_User
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by:John Hurst
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Thanks, and I was pleased to assist. ... Thinkpads_User
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