To change file formats, Microsoft suggests:
Get-ChildItem *.txt | Rename-Item -NewName { $_.name -Replace '\.txt', '.log'}
==F6S API==
F6S has an API, but we have had no success getting a key to the API. The link to get a key to the API is on [https://www.f6s.com/developers/apis/deal-feed this page].
I (Peter) have emailed F6S to ask for a key directly at support@f6s.com.