I don't know where to put this-cache

[junsu.choi]

Well first of all what I'm going to ask about is cache.

let's say there is a file called:

main_file_cache.dat0
and
main_file_cache.idx1

These are from a game; unknown format, if I open it up it comes up like this:
 決|蘭0푮脅U???Y휱. ?음?퀞V?iW怡,쏌^?朝{@ H? ?언?B듵渫?q톶em徐?쿘뮺溯?뜡?;?s迹霙hgwd?|?朗?廬?톂??0x룧酒?폻??T? 쫇?풼뎷뤸W辰틂꼙?娩D?H&aa??t쥉짢yc K7냳띶9얿녓OQ윔\gb?,??홾`+|?^IE킲朗5튛킲?EI?pI-뎙?
?<??#x?% g8묃?뾷^꽎?휜Y??#헺^$@RD8y"\@z( IQK€VyI?v€
@?x5/@?#
엃?덽肅clR|?????H?!??쵔? V?Z???0?×*?뗨T걸Bc<㎓T,?!幣탯F?p쨬*:a$?릟(?i&QE(?!깶 Pr_$싅헴)퉮\?캝?Gh쥈?=c?B5(弱?&`4멻碧?d=?C*H_9 ?2픮QSt??0뮉 廓(QH?G??E쓻쮇?e?&аh??껪D옟??P?裏(塹0#X-Uh쮡)??c!tLKK#뙉2A?삋J?\A?N?\C걾첓슦???b6?檳럩콩룠?쎫롙Y FQ%隧혭b癡?줉A똮??녾愿?럥!b?뒆⒳S2h필W ?N"㎫p 똄岾쾗폷첲': 8??.P㏛?q0?^??즙hg,?퐗뼢읒8?덉?LCP
???U.&ySf價?먆?

얢??'ⓘ귛?쵼?€???L7ff넜Fc??植묿뭪:쵡Rk$?z08몐뛙?j`K?`??}? i5zMz:懼欖Fc星눋눼숏4]^ffnn&!=T/.☞r?> 쫤뿤s??혬???Cu둅얣?Mf?g?썥梱??
⑨j{?툌L)?<겏??y?KN8?h$뀼$:밳)?&흈摺측寸)쀰봖~zoq뼣P??욈 ?-pX?밯祛$;깦젨k?e????蘚쉏<@N?꾈
b빕O?X尉%&?
?=?,졔퇜?잳+;읁죠瑟N(멄둄???꾩햃?6굎?8HFd31츯 S뎋
e 雉O3??ZQ?!?쁳5?襤樹쥩삜€ 괶웩Q>꾓???뒐헇??띵'p€r
?48KNdE
?R ??J?Pr2?I0
&?h
-continues for a long time


get the point? gibberish.

Anyway I can translate, read this?

Someone said something about a java client, but...-.-

[Miz]

What you're seeing is software code.

A search for idx format led me to this page.

I got nothing understandable for dat0.

It's the letters after the dot that tell Windows what to do with the file.

Since I'm don't write software code, that's about all I can tell you.