We have a DocLib with versioning (only major versions), without content approval and documents are not required to be checked out before they can be edited.

Unfortunately when overwriting any document via copy / paste within mapped Windows Explorer (or "Open with Explorer") the version number does not get incremented. It only works, if existing document gets opened directly from this location.

But sometimes the users store big files (in any format) locally for editing and they want to overwrite existing version in DocLib easily via copy / paste instead of using "Upload Document" functionality of SharePoint - only there you can specify that existing files should be added as new version. 

So, is it possible to configure SharePoint that version numbers get incremented in this scenario? Or does it only work with custom implementation?

There is a similar post addressing this issue, but it does not answer my questions:
[How to deal with versioning files that are not types recognized by sharepoint](https://sharepoint.stackexchange.com/questions/29442/how-to-deal-with-versioning-files-that-are-not-types-recognized-by-sharepoint)

Thanks,
Roger