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Open ResEditor, click file\open resource file, and select the game archive you need, for example h3bitmap.lod. Now we have a bunch of files in front of us. You can sort them, replace something, extract (right-click), or edit. Put the edited files back using the following method: open edit\file manager, find the folder with the modified files, and drag them with the mouse into the archive window. After completing all operations, click make change on the toolbar, launch the game, and see what we've managed to do here.
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This is also how you can plug in fonts. Here are some fonts from a pirated version. They are slightly too large, but everything is clearly visible!
Request: if anyone has a licensed copy of Heroes Chronicles, please upload the fonts from there. I remember playing Restoration/Ice Blade, and the fonts there were great. The extraction process is described above.