Machines includes some high(er) quality textures in the install folder, but for some reason they aren't displayed in-game (at least on some computers).

You can get high-quality textures for most units, effects and buildings to work properly without much effort - just copy the contents of the Machines\models\texture4\ directory into Machines\models\texture2\.
To see an example of one of the biggest improvements in resolution, compare these two images:

(This texture is used on the Red team Civilian Research Academy)

Recently I had a look through the Machines\models\planet\ folder and found that certain maps have higher-quality terrain textures, as well as some copies of unit and building textures which are higher resolution than those in the general texture4 folder.

I went through the various folders, found the best available version of each texture¹ and copied them into the appropriate folders (for individual maps and for units/effects/buildings) so they would be displayed correctly in-game.
I then removed the duplicate, unused texture4 folders.

I have uploaded the resulting models folder here: http://www.mediafire.com/download/mi5n3jnmv503pw4/models_texture4.zip (17MB download, 32.7MB once extracted)
(if this is useful enough maybe it could be re-hosted on wiredforwar.org ?)

¹ I left most moon and sun textures alone for now - there are some differences in naming, positioning, etc. which could lead to issues if they are swapped around.

To use this pack:

1. Re-name your existing models folder (e.g. C:\Games\Machines\models) to models_bak

2. Download the above linked models_texture4.zip and extract its contents into your Machines install directory (e.g. C:\Games\Machines\).
   Make sure the new models folder is located directly in the Machines folder instead of a sub-folder like Machines\models_texture4\ .

3. Play Machines :-)

   ?!. If something goes wrong (crashes, graphics glitches, poor performance, etc.), delete the new models folder and re-name the models_bak folder back to models.

Some in-game comparisons:
(I am using dgVoodoo for 32-bit display colour and forced bilinear texture filtering)

Red Dozer Constructor default
Red Dozer Constructor texture4
(the texture for the constructor upper arms and track sides is used on many units and had a very nice 256x256 version hiding away in a map texture folder, mixed with segments of a different texture. I merged the matching parts into the regular unit texture. This is the only "modified" texture in the pack.)

Blue Pod default
Blue Pod texture4
(64x64 → 128x128)

Tutorial floor default
Tutorial floor texture4
(the texture2 version of this terrain texture was already at the maximum 256x256 resolution, but was only in 8-bit colour - containing only 231 unique colors. The texture4 version is in 24-bit colour and contains 36449 unique colors.)

This pack might be useful as a base for modders to make custom skins or further enhance Machines' existing textures.