AirDroid remains a popular way to manage Android devices from a computer, despite security issues in the past (which were later fixed). Sand Studio, the developers behind AirDroid, has released version 3.5 of the desktop client with a full file manager built-in.
AirDroid Desktop 3.5 includes a new folder tab on the left side, which opens the file manager when clicked. All of the files on your Android device can be viewed as if it was a local file system.
AirDroid updates desktop client with a built-in file manager was written by the awesome team at Android Police.