@echo off
chdir /d %APPDATA%\Microsoft\Signatures\
FOR %%I in (%APPDATA%\Microsoft\Signatures\*.txt) DO (
del *.old 2>NUL
echo %%I
type %%I | findstr /b /l /v . > %%I.new
ren *.txt *.old
rename *.txt.new *.
powershell -Command "(gc %%I) -replace [char]160, '' | Out-File %%I; (gc %%I) -replace [char]194, ' ' | Out-File %%I")