Make all instances of a word a hyperlink in OpenOffice

How can I make every instance of a word, a hyperlink to a file on my computer.

I have managed to do it with one instance of the word, but repeating this be time consuming so I am hoping that the program itself can do it.

I also would like to use the %windir% and %userprofile% system variables in the file.

Here is what I tried:

%windir%system32shell32.dll

However this gets replaced (and fails) by Openoffice to look like this:

"%25windir%25system32shell32.dll"

If I add double quotes, openoffice adds another pair to the path and that also makes windows not find the file.

I have looked in edit > File & Replace but dont see any option to replace all instalces of a word with a hyperlink to a file whilst keeping the word the same.

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