wanopt: caching static content without file extensions

Hello!

I've a customer that wants to cache static web content from a intranet site, let's call it "SERVER".

On SERVER, there are a lot of image files that doesn't have a file extension. Ie:

...

There is a clear pattern in the path, and the content type given by IIS is "image/jpeg", however they are not being cached (bypassed).

Is there a way to deal with this without renaming the files (long story)? Something like force caching by content type, or path.

Greets,

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