restore of private directory fails in binary mode

Problem/Motivation

cannot restore .htaccess in the private directory

Steps to reproduce

- restore files in private directory
- the operation fails with "Error while opening private:///.htaccess in write binary mode"

Proposed resolution

Mr. Google found this comment somewhere:
When you transfer your .htaccess file, make sure that the FTP transfer mode is set to “ASCII/TEXT” and not to “BINARY”. If the file is transferred in binary mode you will get an http error 500.

Remaining tasks

User interface changes

API changes

Data model changes