I have the following .bat file:
fbwfmgr /enable
.
.
.
fbwfmgr /addexclusion c: \"some folder 1\"
fbwfmgr /addexclusion c: \"some folder 2\"
.
.
.
You probably need to provide the path to fbwfmgr.
e.g.
"C:\Users\JOHNDOE\SomeDir\fbwfmgr“
Note
You will almost certainly need to run the batch script with administrative privileges too! I know you said you are logged in as the administrator, but you need to be certain that you have the permission for the script to be running especially as you are running it from another application, (inno).