Hi, John-- While this request comes up from time-to-time, I've yet to hear any rational explanation of what such a conversion would offer.
- Wireshark is a low-level packet analysis tool.
- Fiddler is a HTTP/HTTPS proxy.
Anything that you would need to use Wireshark to look at likely would have been altered by the mere fact that a proxy was in place, so using Wireshark to look at a Fiddler capture doesn't really make any sense unless your goal is to debug Fiddler itself.
Can you elaborate?