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I have a COM interface GUID but I don't know that interface definition. I don't know what methods it has, what parameters they have and so on. How can I obtain such information? Is it possible in general?

Practical problem is obtaining interface definition for few COM interfaces defined in actxprxy.dll. For example IFileDialogPrivate ({AC92FFC5-F0E9-455A-906B-4A83E74A803B}). (Obviously the interface is not documented and the name does suggest there is a reason for that.) I tried to use OLE/COM Object Viewer (OleView.exe) for that but wasn't able to get the interface definition.

I am trying to implement IFileDialogPrivate while doing some experiments on forcing IExplorerBrowser control to filter Windows 7 library folders. IFileDialog (which seems to use IExplorerBrowser) does it somehow and IExplorerBrowser askes service provider for IFileDialog and IFileDialogPrivate if ICommDlgBrowser is provided so I tryied to explore that interface. (Also it asks for few other interestingly named interface - could be useful).

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    It isn't available and no way to get it either. The only reason you know about it is because its proxy is registered, allowing the debugger to dig the name out of the registry. Reverse-engineering COM interfaces isn't possible. Even if you managed to guess at the interface, it is guaranteed to break in the next Windows version. Or the previous. Don't go there. Commented Sep 2, 2011 at 8:56
  • Yes. I expected that using such interface will lead me to heavy dependence on environment. But since I already run out of ideas this became new goal on its own. A bit more research/learning/experimenting/playing than actually doing the task. I left the IExplorerBrowser until it will be able to filter properly. Commented Sep 2, 2011 at 10:30
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