How to open or convert a large 3d model?

Question

3D

There is a model in obj or ztl format. Number of polygons 7.5m.
I can't open. Writes - there is little memory, or crashes. (blender, 3dmax, meshlab)
And what do respected 3D people use in such cases?
Opened in VirtualBox.

Answer 1

In this case, 3D-shniks buy more memory and install 64-bit programs.
In general, 7.5m polygons is not so much, I also opened large files on 4 GB (3D Max, ZBrush).
Maybe the file is broken?
PS: And programmers write a utility that splits the file into several smaller ones, since .obj is a simple text format.