Unable to clone a WordPress instance: Path not found

Symptoms

1. The following error occurs on attempt to clone a WordPress instance:

   PLESK_ERROR: Path not found

2. In the logfile %plesk_dir%admin\logs\php_error.log with debug mode enabled the following error can be found:
   

   [2017-08-21 17:16:23] DEBUG [util_exec] [48703df3770328f90ba88685f01ab603-0] Finished in 0.0287s, Error code: 0, stdout: <XmlError Error="Path not found." ErrorCode="path_not_found" ErrorDetails="Unable to get file (C:\Inetpub\vhosts\example.com\httpdocs\my+file.html) attributes: (2) The system cannot find the file specified."/>

3. The actual name of the file "my+file.html" mentioned in the error above is "my file.html" (with a space).

Cause

This is a Plesk bug with ID PPPM-6956, which is planned to be fixed in future Plesk updates.

Resolution

As a workaround, do the following:

1. Rename the file "my file.html" to "my_file.html" 
2. Clone a WordPress instance
3. Rename the file "my_file.html" back