Ok, here's what I got :

- I first killed and deleted the service from the list :
"C:\Program Files\ruby\bin\ruby.exe" "C:\Program 
Files\RR_Outils\FileHandler\FileHandler.rb" -k -> Got the message 
"service killed" in the out_file
"C:\Program Files\ruby\bin\ruby.exe" "C:\Program 
Files\RR_Outils\FileHandler\FileHandler.rb" -d -> Got the message 
"service deleted" in the out_file

- Then I reinstalled the service :
"C:\Program Files\ruby\bin\ruby.exe" "C:\Program 
Files\RR_Outils\FileHandler\FileHandler.rb" -i -> Got the message 
"service installed" in the out_file

- Then I started the service :
"C:\Program Files\ruby\bin\ruby.exe" "C:\Program 
Files\RR_Outils\FileHandler\FileHandler.rb" -s
-> Got the message :
One moment, start pending
One moment, stopped
One moment, stopped
One moment, stopped
One moment, stopped
One moment, stopped
One moment, stopped
One moment, stopped
...

If I look in the Services List, the Service FileHandler is Installed, 
but not running. If I try to start it, I get the message "Impossible to 
start the FileHandler service on the local computer - Error 1067 : 
process has stopped unexpectaly"
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