The file must be saved as a .jpg image, as this is the only format that can be applied Cimatron modeling.
You will need to go into the View> Settings> Light Settings function.  Then to the texture tab of this pop-up.
Here you can pick textures, which are really just .jpg files.  Any .jpg can applied as a texture, even your own.

*Note that you cannot browse here.  The picture file already needs to be in the CimatronE\data\textures folder structure.
Pick a face and apply the texture.  As it is a jpeg, there is no dimensional size control.  You only have slide bars for size or rotation.