That's not a rule I've ever seen anywhere, nor is it enforced, nor practical.
I upload a new index.html file about every two months. Always the same name.

Yes, a file named index.html may be uploaded more than once. I didn't mention the exception, because I didn't think it would be relevant information. It is now, though :)

From http://pause.perl.org/pause/query?ACTION=pause_04about, I quote:

Please, make sure the filename you choose contains a version number. For security reasons you will never be able to upload a file with identical name again. This strict requirement does have one exception: documentation files may be overwritten. There's a simple regular expression that draws the line between docu und code: /(README|readme|\.html|\.txt)$/. Filenames matching this RE can be uploaded as often as you like. By the way: it is highly appreciated, if your packages come tarred and gzipped with a Makefile.PL, so they can be installed in a standard way.

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