Description:
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When using the attached script (saved as UTF-8 without BOM) to generate a word document, at the end of the text typed programmatically into word a "?" character gets added. This character is only visible if I press the inverted "P" button on the toolbar. This is a reduced test case, but in real-world scenarios, visibly garbled text is inserted into word.

Reproduce code:
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<?php
   unlink(dirname(__FILE__)."\\test.doc");
   $word = new COM("word.application", NULL, CP_UTF8);
   $word->Visible = false; // hidden
   $word->Documents->Add();
   $word->Selection->TypeText("This is a t?st...");
   $word->Documents[1]->SaveAs(dirname(__FILE__)."\\test.doc");
   $word->Quit();
   $word = null;
   header("Content-type: text/plain");
   echo "wrote file to ".dirname(__FILE__)."\\test.doc";
?>

Expected result:
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The COM automation should accept UTF-8 formatted PHP strings without malforming the string ending when the CP_UTF8 parameter is added.

Actual result:
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Broken characters at the end of every string containing non-ASCII characters sent via COM automation.