Need to delete all the files with one extension on a drive in Windows 7

I have a drive filled with 1000's of files spread across hundreds of folders. I was using a sync program that created many placeholder files throughout the drive. I need to delete all the placeholders but leave the folders and other files intact. I am using Windows 7.

Answer

I found my own answer at the command line.

del /s *.wlx

where wlx is the file extension in question.