Importing UTF-8 Converted Files as Formatted

Converting documents to UTF8 that were generated outside of WP with Notepad or other editors saves these as plain text. You then have to manually add back formatting inside the WP editing window.

There are editors that can save UTF8 with formatting (WorldPad); however they save these files under the xml file type.

Anyone know if there’s a way to bring these into WP in order to avoid re-stylizing long imported posts, etc.?

Thanks.