[Paraview] Load many VTK from different folders at once

[lore]

Hi all,
I am using openFoam and when I run foamToVTK I get many vtk files every each 
one of which is contained in a different folder. If my geometry is made up by 
many .stl different files then I get the same number of folders. This is quite 
annoying when I need to load up the whole geometry because I need to enter 
the first folder and load the first .vtk, then go to file-->open-->enter the 
second folder and load the second .vtk and so on until I loaded all the files I 
need. As you may understand this is quite time consuming… Any way to do the
whole process at once? 

I think the best way would be to link together all of these vtk files into one 
single file (even of a different format) using a script (sh, python, bash…??).

This is something you may do with the .stl files, if they are in binary format 
you may concatenate the content of each one of them into a single different 
file and then load just that one to have everything at once…

What do you think?

Thank you!