Personally I prefer the kebab/dot conventions simply because they allow for easy "navigation" with (ctrl+arrow keys) between each part. What are your preferences when it comes to this? Did I miss any schemes?
That's called camelCase, right? starting off small and then use Upper. Hungarian notation is a form of camelCase, just with the type added in front I think. But that's for coding standards, not filenames. One can think of Hungarian notation as to what file extensions is to files, just added in front. Imagine files named as "txt.MyFile", just for illustration.