; Build an array with possible filename examples. Since "." is a

; valid character in a filename, one cannot simply do a Split on

; all "." delimiters. Also, a filename does not necessarily have 

; to have an extension.

;

$files = "file.txt", "file.1.txt", "file.1.2.txt", "file1"

 

; Enumerate the array.

For Each $file in $files

   Iif(  ; There are two possible returns, one with a file extension

         ; and one without. Therefore the Iif function is a good choice.

      Instr($file,".")

         ; First parameter of Iif. If there is a "." in the filename,

         ; the characters after will be considered the file extension.

      ,Left($file,InStrRev($file,".")-1)

         ; Second parameter of Iif, which is the return value if parameter

         ; one is TRUE. Uses InStrRev to find the first "." going from 

         ; right to left, subtracts one from the return value of InStrRev,

         ; then uses that value to return all of the characters to the Left

         ; of that value.

      ,$file) ?

         ; Third parameter of Iif, this is the return value if parameter

         ; one is FALSE. Since there is no "." character in the string, 

         ; simply return the filename.

Next