Base needs the numberformatter to initialize a document

(Thank you to Ivan and Riccardo for their suggestions)

By removing WinPath. The paths already have good format.

This reverts commit 6396ab80.
per the author's request

* boolean, string conversion.
* removing virtual keywords when it makes no sense.
* privatize methods that are called only from within.
* removed methods that are not used.
* etc.