Using Coordinates

Greetings, I am very new to 3D modelling. I have component models for a game which are in a text format, where the mesh is described using vertex coordinates. I was wondering if it is possible to input a set of coordinates and construct a model that way, and also to see a list of the vertex coordinates which I can copy back into a text file when I adjust a shape or make one. This is a problem as the game I am modding is old and incompatible with Blender. Any help would be appreciated.

If you know the file format which your game uses, you could change it to to import in blender.
Export model in ASCI version of ply and convert back to one your game uses.

Thanks for the reply, I will have a go.