Byron, You can handle all unwanted chars but You must decide what chars You wanted in the file.
Something Like this (It is based on a previous thread here in UT but I am not a PUTM and can't do a search):

myFileAsString = FILETOSTR(".....")

myWANTEDChars  = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
myWANTEDChars  = myWANTEDChars + LOWER(myWANTEDChars) + "0123456789" +....&& etc.

notWantedChars = CHRTRAN(myFileAsString, myWANTEDChars,"")

finalFile = CHRTRAN(myFileAsString, notWantedChars, SPACE(1))

STRTOFILE(finalFile, ".....")