Adding textures (newbie and using 1.4.1)

[psycholinguist]

Hello!

I'm trying to create some 3D models of my furniture. I got pretty far reading tutorials and such (after giving up on Blender and finding Wings 3D... Wings 3D saved my project).

But I'm having some problems adding a wooden texture to some faces in the model. I must say, I have an old Mac OS (10.6.8) and don't really want to update, so I had to install Wings 3D version 1.4.1.

Problem 1) I didn't really want to use BMPs for my external texture files, but when I tried to change the extension to JPG or PNG, Wings told me I couldn't save the file under that name: "The required extension is BMP".

Problem 2) After editing the external file in the Gimp, I tried loading it by right-clicking on "cube1_auv.bmp" in the Outliner. However, the pop-up menu there doesn't contain "Refresh". It only has "Show", "Make External", "Exxport", "Duplicate", "Delete", "Rename" and "Pick up Image".

How can I fix these problems? I really hope these aren't known bugs in 1.4.1 with no way around them...

Can someone help me?
Thanks!