whoops, that's another bug
{.exec.} has been actually broken in version #232 when i introduced optional parameter "out".
at the moment it is not working without this optional parameters. it's like it is not truly "optional"
i will fix this bug too in next release.
i hope to publish it tomorrow!
in the while, you can use this version. it should work.
{.exec|C:\notepad.exe|\boot.ini|out=xxx.}
you can post in the italian forum if you like