Еще кое-что, если это надо делать не "на лету", а в фоне, то можно попробовать через xml.
Но тут надо пробовать, экспериментировать.
<div class="sp-wrap"><div class="sp-head-wrap"><div class="sp-head folded clickable">кусочек xml с DisplayAsIcon</div></div><div class="sp-body"><div class="sp-content"><par def='1'><objectref version='2' name='EXT04539' class='WordPad.Document.1'
displayformat='icon' description='Документ Wordpad' classid='{73fddc80-aea9-101a-98a7-00aa00374959}'
storageformat='structstorage'><picture width='96px' height='81px'><gif>
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</gif></picture><run
><font name='monospace'/></run></objectref></par>
<div class="sp-wrap"><div class="sp-head-wrap"><div class="sp-head folded clickable">кусочек xml с DisplayAsRT</div></div><div class="sp-body"><div class="sp-content"><par def='1'><objectref version='2' name='EXT35943' class='Word.Document.12'
displayformat='richtext' description='Документ Microsoft Word' classid='{f4754c9b-64f5-4b40-8af4-679732ac0607}'
storageformat='structstorage'><run><font size='11pt' name='Calibri' pitch='variable'
truetype='true' familyid='20'/>Текст в Word</run></objectref></par>
<par def='1'/>
