Well based on your message, I guess you mean download files, not upload.
Please note web browser can only preview certain file types:
JPG, GIF, BMP, HTML, Text files, PDF, some streaming media files, etc.
For Microsoft office documents, if you have Office or Office Viewer installed, you probably can preview them in Internet Explorer. To download the files, please select one file only and click on Download button in the ShowFolder page; you can also click on the Download link it the ShowFile page.
Please also note DriveHQ FTP service can be used to drag and drop files without installing any client software. Windows Explorer supports basic FTP features. You just need to enter: