Using mysql to backup database - weird characters in the dump file

I am using mysqldump. When I open up the dump file that it created using notepad, parts of the file look like this:

Uë*O\0Š‡ã=ãúw{r€bÊð½|0ë÷(2âðÁ}ò±.ðÀ^<ò[®Ý(¶Bڐìÿ‘¶Ã*5¸ÔgJÚ¨ü3¶ñC+þE$P2´H4iÿ‡šñ ï<CŽLIØ^*Cïèļ5ÅÔ\0 ´b¹3û¯ƒD™ksœ”—ÞÂ5¼âèZF{³‡z0Àa6£e”JJ+ìdÌë¹tãÚ0«\råMþÜ‹`‘…¢²\r5.ê±ÐdÊ•—õ<¥Ž¯{ÅN¿®&Ü4ðëJ…Ø¥EtA¹ØŠçßøàG!ü¥jN³8bµ¢A†ŸWA5\nóµó¬¯Ï_€è5í¨.Î-Îk¯¬* Ï,R°„¸¾¬Ë´\"3]Z8W¯cÓJUêõ¼qkÏP÷›þ,ù¾sÉ·¡ôD£üÈ¡~a¤’\nº¶ž›DD¯A tÛ”eÝÒÑø®ŸÜX·?½¬ZYé\'Ñ£^F_ã>ó,á‘n=ÛñYÊBì¿SÎ_ÃMÙ{ã\'–½¥Û>Z}Þ£p{¤‚Àû•{owùª!_Þ…3æâ÷Ò^Ôme!=¶”ªmQü®‚´¤Ã¬jr\\9„÷áÞƒGï9„wf\\ìíÂuaåÜCVZŸ†¢ÀJ1»Û`mÞ˜ç:æ9éîî~‚ø³·;#xwûÑâ2(,Í؏%·0ӏºlÊìÍ„ÏÏ‚XøÔ;ŠÞ½5„ ügXmD‘Pí`|gßàü@}«g$™{”      ç5`ÑîÕŠ¶¨Y$JdY¿¼E‚K‹h˜=:\"òrÅqà7ÌÊOŠB+ðü’¼O6Ò%¤e®}Aún,eR.Ëx1¢;bÏe*q¸ÎDõ2P`ÁJö e“„6BJ?PóÏYeŒeâ¡‚5)ì°Û %ݐX,\Zg@o¿H:ƒ¬VNo¶Ï      {j—¦×Då69懋œRù‰€9]en«\'hësMG®hþlTbyï*ñÚ‘ÃÓl^ýVƒY¹¹*«CÖúŠœ¦·kl2CEž¢Òž;H°‘™¼9¨q‚?‘ĐfãfF˜æ~p¯õÖ¦¡t`]×’Nt€9êÿת0-yu-•Mk_}];6ÆÃj|ëL•`&ü\\Ä«£ì9ŠªÝ[ZÅ>N…!ê[\Zª@ÅQíî\"Fìlíí<x¿bÄV}KYâ3Nýá6Þf¯ºÉò+з“r5aâ3thÐsôÜõ¥‰Ï>„4ñµÕR± ›„þFW)µÁ\Zx%Bm±lÂ-µ`²ËF(š”ú¨÷ù¨¥‰å¡´Pº\0ˆ½Ùb)sï9×Ú¢Jþ9`5Œbó«rQ;)÷EY,²Ã£ÀÔøe×dÖzÌcŸÅv¤*’eïqŠŸ‰ó2\r¹½z³Ÿ¦&ŽjÖ-ö¢µÉˆ~!i£Œ¦IéÆ•ð“õyDœt4êþY•?à·I>bCŠì]‹Òjb[\"ç!7@‡D/-¸ÃAµ“rJÕ>ÚhzÁ¨käÎïÅS¯Àwšõ6§h×\"¦†^\0x9&ëZ´Ø«¥ÇèÝÓ1@ä„ÚÖeƒÉpTµ×¤V אS»À`šBK´™…LïGáµn5žX{JÛD·0ž][õIK?F’¿ªouâ—Ý¥ƒ\nûò5Æ\rÊŠï/EC’Oëç\ZӏܟN\'ÃÕS›gJè¡£F‰Là DÀ¨²\r:Y>QÝg<c‡pæ?#]      ƒì{×c®’˜ÿŠ9ÑŽ¿v\'`N-åã _yL\n!B~?Í9Ç™~b¿œÁQ„öÀz¸€gøz+Üsu)ø.B™À¬«7I¸‡£¢ºÜ§ZPÛhñtbB°˜„T®¡¤ê|دÎ,úïšÎÁÈ,3QA’bäĈ’      m8Ýü8¨H:‡V-aÑ\Z£¡;kÜF‹ðùA±V‰R²Þxç$6$§sɯ¿A÷ÒL.M¢7 Øâ’>²F6®>͐*ù

Most of the file is in readable English, though. What's the deal with this? Is this normal? Will the import work without a problem?

Here is my command:

mysqldump --opt --user root --password=1q2w3e4r wikidb > sql.dump