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It's not the name of the file, but the value of some "name" attribute used inside the file.
First, you should not use "name" for anchors, but "id".
Second, the value can only contain some characters and must start with a letter. The files probably have something like name="12", change it to id="sec12" or similar and it should work (and you should change all references to #12 into #sec12, of course)
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