(defun c:expl-p () (vl-load-com) (vlax-for b (vla-get-Blocks (vla-get-ActiveDocument (vlax-get-acad-object))) (or (wcmatch (vla-get-Name b) "`**_Space*") (vla-put-explodable b :vlax-true))) (princ))

From http://discussion.autodesk.com/forums/thread.jspa?threadID=664951

Start the Block command, select the block from the drop down in the Block Definition window, check the box Allow exploding, save.

http://forums.augi.com/showthread.php?t=89993&highlight=explode%2C+block%2C+Autocad

Solution  #3 (a work around)

Did find a work around by using 09’s block editor, copy all entities, open new drawing, paste all entities, then make a new block with the all exploding checked. Then delete the original block, purge and insert the new block and explode.

Did find a work around by using 09’s block editor, copy all entities, open new drawing, paste all entities, then make a new block with the all exploding checked. Then delete the original block, purge and insert the new block and explode.

Did find a work around by using 09’s block editor, copy all entities, open new drawing, paste all entities, then make a new block with the all exploding checked. Then delete the original block, purge and insert the new block and explode.

Did find a work around by using 09’s block editor, copy all entities, open new drawing, paste all entities, then make a new block with the all exploding checked. Then delete the original block, purge and insert the new block and explode.