From CURRENT:
File_Name (additional info).txt
To WANTED:
File_Name.txt
TRY:
Remove(5) , Crop , 
Special:  
(*)       - - -
Help wrote:Removals - Remove parts of a filename 
This section consists of four separate facilities for removing parts of a filename. Note that these do not apply to the file extension, just the name.
· First n chars - Remove the first n characters from the name. E.g. removing the first 2 characters from "Joe Public.txt" will result in "e Public.txt" 
· Last n chars - Remove the last n characters from the name. E.g. removing the last 2 characters from "Joe Public.txt" will result in "Joe Publ.txt" 
· From n to n. This allows you to remove a string of text, e.g. from the 6th to the 9th characters. 
· Chars - Remove occurrences of characters from the name. E.g. typing "QW:#" will result in all occurrences of Q, W, colon and hash being removed. 
· Words - Remove occurrences of words (separated by spaces) 
· Crop - Remove any text which occurs before (or after) a specific character or word. See below. 
· Digits - Remove all occurrences of the digits 0-9 from the filename. 
· Chars - Remove all characters 
· Sym - Remove all symbols 
· High - Remove high-ASCII characters (chars from 128 to 255) 
· Trim - Remove leading and trailing spaces 
· D/S - Remove occurrences of double spaces, and replace them with single spaces 
· Lead Dots - remove the . or .. from the front of filenames (useful if you've copied from a Linux/Unix system). 
When you use the "crop" option, you have the option of specifying a "special" value using the wildcard (*). 
This will remove the specified string, and any characters occupied by the wildcard. 
So for example, specifying [*] would convert "Hello[ABC] Joe" to just "Hello Joe", as it has removed the two square brackets and everything between.