Hi, Anonymous Monk
this is just a hint, but it would help you receive answers if you explicitly stated that this is MS Word you're talking about, rather than hoping someone recognises the code or spots that wdFindContinue is a Microsoft Word constant.
As a start, can you show us the code you use to assign $rng, please?
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Want more info? How to link
or How to display code and escape characters
are good places to start.