Final word.

Put your url file or document with the address into your shares, then use LW to describe it so the description will help people find it by one of the description words linking to their searches. Vaguely a little similar to how paying google for your site to appear in searches works (not refering to the adverts.) People will then be able to find it using your description terms as well as the actual filename. Go to LW's Library window, select the file & press the Describe button. You may be aware of other means of adding a description to a file.

The extension files you can share are listed under LW's menu bar, Tools>Options>Sharing.

htm & html are listed here. However, you'll notice under Tools>Options>Filters>Keywords that some people filter out such files. So perhaps you could share both a htm file & another document file with the address. Besides, there's more than one type of url file; eg: xml & at least a couple more.