C:\>cmd /s /c ""c:\program files\replace.exe" > "c:\temp\my folder\a.a""
Source path required

C:\>type "c:\temp\my folder\a.a"
No files replaced

C:\>echo>"c:\temp\my folder\a.a"

C:\>type "c:\temp\my folder\a.a"
ECHO is on.

C:\>cmd /c ""c:\program files\replace.exe" > "c:\temp\my folder\a.a""
Source path required

C:\>type "c:\temp\my folder\a.a"
No files replaced

C:\>