Use VBA to Create Bookmark to Execute a Menu Item (Open File)

Hi

I am designing an Access Database that combines a number of PDF documents and adds a set of bookmarks to various locations in the document , and also to a number of files and / or folder external to the PDF document. Currently I using VBA to open the PDF object and create the set of bookmarks, which for the most part work fine, however the are some issues:  some of the linked JPG or other graphic files open in a browser  (not the associated graphics program) or not at all  (The cause is not a file association issue).  Oddly, the resulting PDF will work correctly with some PDF readers and/or versions of Acrobat. but not in others.

I have included some of the code below which should explain what I am doing:-

     'Late Binding

    Set gApp = CreateObject("AcroExch.App")

    Set gPDDoc = CreateObject("AcroExch.PDDoc") 

......

    If gPDDoc.Open(sTargetPDFPath) Then

Set jso = gPDDoc.GetJSObject

Set BMR = jso.BookMarkRoot

BMR.createChild "My DOCUMENTS", "", 0

BMR.createChild "SUB HEADING 1", "", 1

     ... etc...

Then I iterate though some DB records to retrieve file paths and create the Java script  App.LaunchURL call which is added to the bookmark  

  sPath = RSLvl!ExhibitBMPath        '(Get file/folder Path from DB)

  sBMName = RSLvl![Bmk_Name]   '(Get Bookmark Text to display)

  bmcChldLv2.createChild sBMName, "app.launchURL('" & sPath & "', true)", PositionIndex     '(Create and insert the Bookmark)

What I would like to do instead of using the app.launchURL code option (which I believe is the likely cause of the intermittent issues I am having)  is to use the   'Execute a Menu Item'  > 'Open File'  and/or 'Execute a Menu Item'  > 'Open Folder'   (naturally providing the path to the relevant file/folder.)  which are options available when you are manually creating bookmarks in Acrobat.   

(All bookmark create manually with the Execute Menu Item option (open file / Open Folder) to the same file/folder paths inserted by the database work as expected.)

I have googled for days and days, read an re-read the SDK and numerous other on-line publications and bits and pieces, which was all helpful and helped me with what I already have, but for the life of me I can not workout how to build the bookmark to Execute a Menu Item (rather than App.LaunchURL)

An assistance or advice would be greatly appreciated.

Thank you.