Problems with the installer.php file coming with random code

Hey, i have just backed up my web site using duplicator to upload it to another host. for some reason the installer.php file is coming out like this

‹ ìýûz¹Ò0Žþí<ÏÜC‡•ì˜3ÆÇ8ØÆÆ`sð)Éâm ¶Æ4âïÙ·±oo_É®IÝêv2Yëýö~~öLÝRI•JU¥RÕ§/ãþøwñ¼S”œ1~œè½þTI%’ÉhrCQÌ‘:nO4í6Ö6†¼ÃRõ¾n*ã‰Ñ›¨C>váµbÝé\h;Ê£1SÚêH™hÝœNôÖlª)úTQG¸1Q†FGï>”x6u´‰2íkÊT›MÅèÒ—ƒrC9ÐFÚD(§³Ö@o+%½­L-¢ÜkS7FJ:¢¨&‚c³¯u”Ö#ÕÞÇþÔx”}Q§P%æß}»—E„¾1†õÕ)öq®JKSf¦Ö

Would it be something i am doing wrong?

Thanks in advanced for any feedback