File explorer lag when opening windows directory

[rusty]

All of the sudden, I takes almost 2 minutes just to open the windows directory using wm file explorer. The window wheel icon will keep spinning for minutes.

The files that I added to the windows directory were wmvdecoder.dll and wmadecoder.dll (for TCPMP), started the delay. After deleting them, things ran fine again. So does this mean that adding files to the windows directory will cause this lag??