Just enter file:///H:/Documents/INTERNET/HOMEPAGE/CowetaLinks.htm without the " " and press Space.
If there are spaces in the path or file name then select your link text and press Ctrl+K (Insert > Hyperlink), in the dialog choose document or Internet as appropriate, paste your path in but be sure to remove any " (quote marks) at the beginning and at the end of the path or it will create the hyperlink as ““file:///H:/Documents/INTERNET/HOMEPAGE/CowetaLinks.htm”” (double set of quotes) which will fail. If you do get a fail then right-click and select Edit link.
I don’t think you can create a hyperlink with spaces in the path without using Ctrl+K. The dialog is easier to read if you drag the edge out sideways to make the size it used to be. Cheers, Al