cronjob issue not running

i created RC-Cron.txt in /etc/cron.d folder i have these lines in there:

MAILTO=mymailaddress

#rainbowcode
5 8 * * * root /home/rainbowcode/DB-Query-Script.php rainbowcode yesterday mymailaddress

my cronjob is not running, i see from other example开发者_如何学Pythons the script it must run is a .sh??? and can i save the cronjob as .txt??

can someone help me fix this please? thanks

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That hashmark in the beginning makes that line a comment. I'm also guesing root is the user you want to run it as, remove that from the crontab, and add the command to root's crontab.