How to make Rubies playable in widescreen resolutions:
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Goto your rubies directory,(default is C:\Program Files\Rubies of Eventide) backup the CWIConfig.dat file and open the original file in notepad. 
Change Screenwidth to desired width (I.E. 1280) and screenheight line to desired height (I.E. 800) 
The example shown below is a copy of my resolution settings and shows what needs to be changed. 
The rest is easy, file, save, then close... when you open rubies it will be in widescreen mode.

example:
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"numconsolelines" "0"
"CWModel_Light" "2"
"CWModel_Shadow" "0"
"DetailTextureScale" "1.0"
"CWSFX_Weather" "1"
"CWWorld_Clipping_Grass" "80"
"DrawPolyGrids" "1"
"EnvPanSpeed" "0.000500"
"ModelShadow_Proj_TextureRes" "32"
"windowed" "0"
"consoleenable" "0"
"Saturate" "1"
"bitdepth" "32"
"HardwareCursor" "1"
"runworld" "Worlds\demoroom"
"screenwidth" "1280"
"ModelShadow_Proj_MaxShadowsPerFrame" "0"
"32BitTextures" "1"
"CWModel_LOD" "2"
"DetailTextures" "1"
"CWWorld_Clipping_Model" "100"
"enabledevice" "##mouse"
"ModelShadow_Proj_Enable" "0"
"CWWorld_Clipping_Tree" "80"
"DrawSprites" "1"
"CWWorld_Polygrid" "80"
"screenheight" "800"
"DrawParticles" "1"
"DynamicLight" "1"
"ShowWatermark" "1"
"EnableCWCache" "0"



To undo this, just put the backup file back or select one of the standard resolutions in options/video in-game.