There are no real short cuts when it comes to stuff like this.
Firstly, it seems to be organised in lines: so start by converting it to a collection of lines.
string lines = File.ReadAllLines(path);
Then, I would probably set up a List<string>for each type you want to extract:
List<string> Points = new List<string>();
List<string> PointDim = new List<string>();
List<string> Size = new List<string>();
Then I'd start looping through the lines separating out the lines into the appropriate collections.
Finally, Id start looking at the collections, and converting them into internal classes (or collections of internal class instances)