CronJob, not working

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What do I have to put in the dointerest.php topic as link (the forum directory) and what I have to put at the cronjob on my hosting account? something like /home/httpd/vhosts/.../httpdocs/forum or just /forum ?

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Errors I get by email:

/home/httpd/vhosts/[mysite.com]/httpdocs/forum/Sources/shop/dointerest.php: line 1: ?php: No such file or directory
/home/httpd/vhosts/[mysite.com]/httpdocs/forum/Sources/shop/dointerest.php: line 2: /**********************************************: No such file or directory
/home/httpd/vhosts/[mysite.com]/httpdocs/forum/Sources/shop/dointerest.php: line 3: syntax error near unexpected token `|'
/home/httpd/vhosts/[mysite.com]/httpdocs/forum/Sources/shop/dointerest.php: line 3: `| SMFSHOP (Shop MOD for Simple Machines Forum) |'