Dir( )

Action: Dir can be used to enumerate the files in a directory. Dir returns a string representing the name of a file, directory, or folder that matches a specified pattern. To retrieve subsequent entries in a directory, specify an empty string (“”) as the path.
 
Syntax: DIR ("path", index)
 
Parameters: Path

Optional string that specifies a file name — may include directory or folder, and drive. If  path is empty (“”), Dir will return the next file of the previously opened enumeration handle. Wildcards (‘*’ and ‘?’) are supported.

Index

Optional number indicating which enumeration handle to use. The Dir function can enumerate two directories at the same time. To open the second enumeration handle, specify 1 for the index.

Returns: Returns a string representing the name of a file, directory, or folder that matches a specified pattern. An  empty string ("") is returned if path is not found or to indicate that the end of the current enumration was reached. Dir also sets the value of @ERROR :
0 Dir successful.
Error code Function failed.
 
Example:

$FileName = Dir("C:\TEMP")
While $FileName <> "" and @ERROR = 0
  ? $FileName
  $FileName = Dir() ; retrieve next file
Loop