Trouble Closing IE Browser with PXV as Reader

[wideeyedguy]

Need suggestions on how to Close (Ctrl-W; Alt-F4) an Internet Explorer window when PDF Xchange Viewer is active as the browser PDF reader.

I have a set of hotkeys which close various app windows when pressing the [Tilde / Accent] key by using #IfWinActive and the appropriate ahk_class or ahk_exe identifier. However, I've tried various combinations of Close type commands and #IfWinActive statements, but AHK just doesn't seem to like them.
Here is how WindowSpy shows the window:

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ahk_exe iexplore.exe
ahk_class IEFrame

as expected for an IE window, yet this is with Xchange Viewer active with a document in the GUI. There doesn't seem to be any other unique identifier except for ".pdf" in the Title.

Here are a few of the combinations that don't seem to want to work:

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#IfWinActive ahk_class IEFrame   ; Has no effect for the Xchange Viewer in-browser window.
`:: WinClose
#IfWinActive .pdf ahk_class IEFrame   ; When there is a PDF doc in the reader, yet this does not work.
`:: WinClose
#IfWinActive Internet Explorer ahk_class IEFrame  ; Has no effect for the Xchange Viewer in-browser window.
`:: WinClose

This hotkey will work for closing the desktop Xchange Viewer program (sans-browser):

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#IfWinActive PDF-XChange Editor
`:: WinClose

Suggestions on what to try?

Thank you,
weg

[wideeyedguy]

Anything I can add here or clarify that would inspire some help?

Thank you,
weg

[wideeyedguy]

Bump
I know this is not too difficult for the experts here.
Perhaps I left out a detail or two.

weg