WebAsyst Files creates a double-zipped archive

To download several files at a time from WebAsyst Files, select such files and use menu item "Actions with files -> Compress as ZIP and save". You can then download the created ZIP archive containing selected files and unpack it on your computer. Trying to unpack that ZIP archive you may discover that it contains another archive file that has no file name extension. This is possible if you are using Internet Explorer as a web browser and WebAsyst installed on web server Microsoft IIS.

To eliminate the problem, changing parameter MIME type on your IIS web server is necessary. Values Content-Type application/x-zip-compressed (or application/zip) and Content-Encoding gzip (or similar) should be changed to application/octet-stream.