my play list is gone

Recently I noticed that within my Library several of my playlist that I did
create are gone How I can get them back?

Have just experienced a similar problem. I cataloge my music on disk into
Albums. I can see my Albums in Windows Explorer, I can see them in the build
list that is presented under Organise > Music, and I have previously seen
them in WMP. Now several have suddenly disappeared from all the categories.
Is there an upper limit on numbers?
How can I get into the WMP database to check?
(Note: OS is Windows 7.)

"EdgardM" wrote:

> Recently I noticed that within my Library several of my playlist that I did
> create are gone How I can get them back?