[Answer]
There are restrictions on the version of Microsoft products (PowerPoint/Excel/Word).
Restrictions on extracting text are described in IM-ContentsSearch programming guide 6.
[IM-ContentsSearch Programming guide]
https://www.intra-mart.jp/download/product/v71_doc/im_ContentsSearch/im_contentssearch_prog_guide_v71.pdf (Japanese)

- Target ------------------------------------------------------------------------
iWP/Web System Construction Platform/IM-ContentsSearch
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FAQID:105