Windows-mounted WebDAV duplicates files

WebDAV seems to create duplicate files when editing with local apps.

Map network drive to http://NUXEO_SERVER/nuxeo/site/dav as Administrator e.g. as Drive N:

Create a Workspace (e.g.) 'misc'  under /default-domain/workspaces

Create a Note in 'misc' folder called 'note1' with format = 'Text'

Click the pencil icon in WebUI and add some textual content e.g. 'This is a test'. Click Save button.

In Windows Explorer, navigate to 'misc' folder under mounted drive.

ACTUAL: See file called 'note1.txt'
EXPECTED: See file called 'note1'

Double-click 'note1.txt' to open in text editor of choice. Edit the content and save.

Refresh folder view in Windows Explorer

ACTUAL: See two files called 'note1.txt'
EXPECTED: See only one file called 'note1' (or 'note1.txt' as above)

(Note that re-opening either of these file in text editor shows the modified content, sinc they have the SAME NAME.)

Navigate to 'misc' folder in WebUI.

ACTUAL: See two files, original one called 'note1' with original content, second/modified file called 'note1.txt'
EXPECTED: See one file called 'note1'

Note that documents created via WebDAV mount are set at version 0.2. Document history shows (in chronological order here):
 - created a version (0.1)
 - created the document
 - modified the document
 - created a version (0.2)
 - modified the document

which all seems a bit strange (i.e. creating a version before creating the document). By comparison, an empty Note document created in WebUI has:
 - created a version (0.1)
 - created the document