Read multidimensional data from a .mat file

I have a big data file (3GB +) that I want to read in Simulink without loading it into RAM. Furthermore, the data is a four dimensional array so I cannot use the 'From File' block (or at least I can't figure out how to)

[w1 w2 w3] = data(t,x,y,z)

What is the best procedure to do this?

Thanks in advance!

[Björn]

I'm not sure this is possible. Unless you already know which portion of the file you want to read (columns and rows)