How to Remove z from more than 1000 files fast?

[Mayssam2021]

I have over 1000 files drawn in autocad map 3d and they all have coordinates. I use the xref command to merge them, but due to the presence of z, their coordinates change. Using the Flatten command for each file is time consuming. Is there a way to delete the z value when using the xref command?

[BIGAL]

Test using Flatten with accoreconsole it is super fast to moify dwg's.

 

https://through-the-interface.typepad.com/through_the_interface/2012/02/the-autocad-2013-core-console.html