New: Wise Duplicate Finder (Jan 23, 2023), Platform 24.0 (Jan 30, 2023)
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E-book reader (txt, rtf, doc) with bookmarks support.
check out eTextReader. It has the functionality you requested and is standalone (only two files needed, the exe itseld and the infozip unzip32.dll component) with a nice UI to boot.
size is about 357kb.