Some basic PS questions:

Sorry for these newbie questions but I am new to Powershell.

1.) How do I find out my current Powershell version (under 64bit Win 7)?

2.) What is the newest PowerShell version and how do I download it (not through MS update channel)?

3.) Do PowerShell script files have a certain file extension which (when double clicked) will be executed automatically (similar to traditional *.bat files)?

4.) If I start powershell from START menu a certain start path is shown.

Is there a way to adjust this path to another directory? (or even better automatically to the last used)?

Thank you

Peter