After a default install of OpenModelica v1.14.1 (64-bit) on Windows 10

When in OMEdit, I try to launch the online help using F1 or via Help>OpenModelica Users Guide

The output in the Messages Browser is:

Scripting Error
Unable to open file file:///C:/Program Files/OpenModelica1.14.1-64bit//share/doc/omc/OpenModelicaUsersGuide/index.html.


The problem is the same for Help>System Documentation

where the output is:

Scripting Error
Unable to open file file:///C:/Program Files/OpenModelica1.14.1-64bit//share/doc/omc/SystemDocumentation/OpenModelicaSystem.pdf.


I think the path is almost right, and I think the problem may be with the repeated forward slashes in the path.
This would appear to be a bug.
How can I fix it?