> The initial report is wrong anyway, because "file:test test.hmtl" is not
> a valid link syntax, i.e., plain links cannot contain spaces. It should
> be:
>
>     (org-open-link-from-string "[[file:test test.hmtl]]")
>
> IMO, there is nothing to fix in the first place.

Thanks - (org-open-link-from-string "[[file:test test.html]]") works perfectly. 

Best,

Joon