Architectural Blocks

I am new to LibreCAD.  I am trying to find blocks that can be used in drawing house plans.  Does anyone know where I can find some that a compatible with this program?  All the ones I have downloaded will not open in LibreCAD, only AutoCAD.

From LibreCAD:
http://wiki.librecad.org/images/d/d9/Architect3-LCAD.zip
http://forum.librecad.org/file/n5708913/arch_blocks.zip

There are some more here (DXF, created with LibreCAD and for use with LibreCAD):
   https://github.com/GSStnb/dxfBlocks

More details at https://forum.librecad.org/Block-Library-td5718156.html

Tanks