Download a .docx file with React Native and RNFetchBlob

Question

I've try a lot of things but nothing works.

I make a function to download .xslx file, and she works. This is my function :

const { config, fs } = RNFetchBlob
    var token = await getToken();
    const link = host + api
    let path;
    if (Platform.OS === 'ios')
      path = fs.dirs.DocumentDir + "/test" + moment().format("DD-MM-YYYY") + ".xlsx"
    if (Platform.OS === 'android')
      path = fs.dirs.DownloadDir + "test" + moment().format("DD-MM-YYYY") + ".xlsx"

    return config({
      fileCache: true,
      useDownloadManager: true,
      notification: true,
      path: path,
      mime : 'text/plain',
      description: 'Downloading file from App',
    })
    .fetch(requestType, link, {
      Authorization: token,
      'Content-Type': mimetype_attachment,
    })
    .then((res) => {
      if (Platform.OS === 'android'){
        ToastAndroid.show(I18n.t("downloadComplete"), ToastAndroid.LONG)
        RNFetchBlob.android.actionViewIntent(path, "application/vnd.ms-excel")
        RNFetchBlob.android.addCompleteDownload({
          title: I18n.t('downloading'),
          description: I18n.t("downloadComplete"),
          mime: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
          path: path,
          showNotification: true,
        })
      }
      else{
        Alert.alert(I18n.t('downloading'), I18n.t('downloadComplete'));
      }
    }).catch((error)=>{
      Alert.alert(I18n.t('downloading'), I18n.t('downloadFailed'));
    })

As you can see, I use RNFetchBlob to download. Everything works fine.

But for some reasons, I can't download a .docx file. The file download, appear in the files app, but I can't open it.

This is the code I use to download the Word file :

    const { config, fs } = RNFetchBlob
    var token = await getToken();
    const link = host + api
    let path;
    let directory;
    if (Platform.OS === 'ios')
      directory = fs.dirs.DocumentDir;
    if (Platform.OS === 'android')
      directory = fs.dirs.DownloadDir;
    path = directory + `/test_${moment().format("YYYY-MM-DD HH:mm:ss")}.docx`  
    return config({
      fileCache: true,
      useDownloadManager: true,
      notification: true,
      path: path,
      mime : 'text/plain',
      description: 'Downloading file from App',
    })
    .fetch(requestType, link, {
      Authorization: token,
      'Content-Type': mimetype_attachment,
    })
    .then((res) => {
      let base64Str = res.base64();
      const dirToSave = Platform.OS === 'ios' ? fs.dirs.DocumentDir : 
      fs.dirs.DownloadDir;
      let fLocation = dirToSave + `/test_${moment().format("YYYY-MM-DD 
      HH:mm:ss")}.docx` 

    if (Platform.OS === "ios") {
      RNFetchBlob.ios.openDocument(res.data);
    }
    if (Platform.OS === 'android'){
      RNFetchBlob.fs.writeFile(fLocation, RNFetchBlob.base64.encode(base64Str), 
      'base64');
      ToastAndroid.show(I18n.t("downloadComplete"), ToastAndroid.LONG)
      RNFetchBlob.android.addCompleteDownload({
        title: I18n.t('downloading'),
        description: I18n.t("downloadComplete"),
        mime: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
        path: path,
        showNotification: true,
      })
    }
    else{
      Alert.alert(I18n.t('downloading'), I18n.t('downloadComplete'));
    }
    }).catch((error)=>{
      Alert.alert(I18n.t('downloading'), I18n.t('downloadFailed'));
    })

I use pratically the same function, but the file is not ok... Someone has a solution about this ?