Here are some examples on the command line that you would pass to the script:
cscript.exe DotUnderscore.vbs C:Temp ._
That would delete all files that had ._ within their filename from the directory C:Temp. Note that directories containing spaces must have quotation marks around them, e.g.:
cscript.exe DotUnderscore.vbs "C:Documents and Settingsusername" ._
As always, test on a test directory before you put it into production. This script may or may not work with certain non-standard symbol or alphanumeric characters in the folder name.
[robg adds: Just to state the obvious, this is a script that resides and runs on the Windows server, not the Mac. These four previous hints deal with the same topic.]

