Moving a file within a folder causes songs to disappear from WMP

When I burn cds onto my PC it creates a file under the artist's name in the
"My Music" folder. Every few weeks I back up all the songs onto a separate
hard drive, after which I move all of these individual artist files into one
general file, which enables me to keep track of what has been backed up. This
general file (I call it
"Songs from CDs not kept"), is located in the "My Music" folder as well.
I've been doing this for a long time. However lately when I move the songs
into the general ("from cds not kept") file they disappear from WMP. This
never used to happen, and I don't see how I'm doing anything different.

I cannot for the life of me figure this out!

Of course the songs are still on my computer, and if I go into my PC
folders & click on one it will play through WMP & then reappear in the WMP
library. But it will no longer retain the information of when it was
downloaded or anything else I may have added at that time.

As a former DJ now trying to reduce my vinyl/cd collection, I have way too
many songs to have to one by one re-add them to WMP; besides, why should I
have to? There's got to be a solution out there. I hope someone can help me
find it!

Thanks so much!

 

Thanks for your response, Neil!

I did as you suggested, adding the general (from cds not kept) as a
monitored folder. It didn't help to keep the songs from disappearing from the
playlist, but it will re-add them if I go back into the F3 (add to library)
screen and click ok (at which time it will go through ALL of my folders
again, which takes a lot of time). But again, it re-adds them at the current
date/time, losing the original information. I guess that's not critical, to
know exactly what date I burned something onto the PC, but there's got to be
a better way of doing this! Not to mention, this never used to happen, so why
now?

Just to clarify, WMP IS adding new content to the library; there's no
problem adding new songs and the data about the songs. The problem occurs at
the point where I change the file where a song is located on the PC itself,
even though it stays within the "My Music" folder.