Lots of files in Windows Folder - Space Decreasing - Please Help!

[peridoc]

I have a TP2 running the stock Sprint 6.5 ROM and I have not installed anything new recently. I noticed that my free space went from about 50+ MB to about 25 MB on its own over the course of the last few months.

When I look at TreeSize Mobile, it tells me that most space used is in the Windows folder (not a huge surprise) but it also indicates there are ~9500 files in the main Windows folder alone (not incl subfolders). First off, is that normal? How many files are in your Windows folder?

When I look at the files, a bunch start with numbers. Some look like registry entry names (ie, xx-xxxxxx-xxx-xxx) and a lot have a number followed by "_manila". What are these? Is there a tool or safe way to clean this stuff up?

Any help would be appreciated as I am not sure what is happening to my free space at the moment.