I suppose it would be an option, but why would I want to? I just want to run a single command line utility, not much different than using the Execute Process Task to run a command line option to unzip a compressed file.

I recently found out solution: in the Arguments box i put:

"(get-content 'C:\YetAnotherFolder\MyFile.txt')| foreach-object{$_+',,,,,,,,,'}|set-content 'C:\YetAnotherFolder\MyFile.txt'"

and it looks like it works perfectly.