Have never heard of anyone doing such and seriously doubt if it's possible. Memo Fields have a bad reputation in some quarters, being blamed for corruption, among other things. I've used them for years without encountering these problems, and I attribute this to my following one simple rule:
Only use Memo Fields to store 'essay' type data, notes, commentaries, narratives, etc. They shouldn't be used for any data that you will ever have to manipulate in any way, shape or form, such as searching, sorting on or parsing out into its component parts! They are to be used in much the same way as a diary would. Any piece of data that requires manipulation belongs in its own, separate Field.
What, exactly, are you trying to do here? Perhaps we could come up with an alternative solution.
Linq ;0)>