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Some malformed backlinks are worth contacting the linking website about - that's where the report can be useful.They appear to be from an overseas spam hut. A few similar sites to mine are also appearing in my error'd URLs, so it isn't just me that's getting targeted.
I would implement a redirect, especially if you actually have a page.php.
I would implement a redirect, especially if you actually have a page.php
RedirectMatch 301 ^/(.*\.php).+ http://example.com/$1
RedirectMatch 301 ^/(.*\.html).+ http://example.com/$1
if Googlebot can find a link, so can users
When I see something odd in logs, like a 404 ending in ".htmlWill", I know it's only a matter of time before it shows up under Crawl Errors.