Generally speaking, I understand the answer to be yes.
I read that one of the purported justifications for that legal distinction was that some fixed blades could be simply pulled out of their sheath and immediately used to stab. A folder, on the other hand, required at least one further manipulation (opening) to make it readily capable of being used as a stabbing weapon. In the old days, many folks would reach down into their pocket to retrieve their folder, then employ two hands to open it using a fingernail groove in the top of the blade. You can see how legislators might have thought the folder was not as readily available as a weapon. Now days, with waved folders, assisted openers, pocket clips, wider use of locking mechanisms, etc., the distinction may be much less significant.
DancesWithKnives