Ionic inappbrowser can't open a tag on app

Ionic Framework ionic-v3
#1

Hello
I made app with inappbrowser
all works fine but when I click below a tag on app, it should download file, but nothing happening.

what should I do ?

ngOnInit(){ 
    const options : InAppBrowserOptions={
      location:'no',
      clearcache:'yes',
      clearsessioncache:'yes',
      mediaPlaybackRequiresUserAction:'yes',
      hardwareback:'yes'
    }
var target="";
    if(this.platform.is("android")){
       target = '_self'
    }else{
      target='_blank';
    }

    
    const browser = this.inapp.create("http://www.xxx.com/home/m", "_blank","location=true")
  }

<a href="javascript:file_download('./download.php?bo_table=counsel_br&amp;wr_id=4617&amp;no=1&amp;page=3', 'file2of7.jpg');" title="">&nbsp;<span style="color:#888;">file2of7.jpg (3.8M)</span>&nbsp;<span style="color:#ff6600; font-size:11px;">[1]</span>&nbsp;<span style="color:#d3d3d3; font-size:11px;">DATE : 2018-07-17 18:34:48</span></a>

#2