diff --git a/src/app/files/browser-files-tree.js b/src/app/files/browser-files-tree.js
new file mode 100644
index 0000000000..e04850602d
--- /dev/null
+++ b/src/app/files/browser-files-tree.js
@@ -0,0 +1,130 @@
+'use strict'
+
+var EventManager = require('remix-lib').EventManager
+
+function FilesTree (name, storage) {
+  var self = this
+  var event = new EventManager()
+  this.event = event
+  this.type = name
+  this.structFile = '.' + name + '.tree'
+  this.tree = {}
+
+  this.exists = function (path, cb) {
+    cb(null, this._exists(path))
+  }
+
+  function updateRefs (path, type) {
+    var split = path.split('/') // this should be unprefixed path
+    var crawlpath = self.tree
+    split.forEach((pathPart, index) => {
+      if (!crawlpath[pathPart]) crawlpath[pathPart] = {}
+      if (index < split.length - 1) {
+        crawlpath = crawlpath[pathPart]
+      } else if (type === 'add') {
+        crawlpath[pathPart] = path
+      } else if (type === 'remove' && crawlpath[pathPart]) {
+        delete crawlpath[pathPart]
+      }
+    })
+    storage.set(self.structFile, JSON.stringify(self.tree))
+  }
+
+  this._exists = function (path) {
+    var unprefixedpath = this.removePrefix(path)
+    return storage.exists(unprefixedpath)
+  }
+
+  this.init = function (cb) {
+    var tree = storage.get(this.structFile)
+    this.tree = tree ? JSON.parse(tree) : {}
+    if (cb) cb()
+  }
+
+  this.get = function (path, cb) {
+    var unprefixedpath = this.removePrefix(path)
+    var content = storage.get(unprefixedpath)
+    if (cb) {
+      cb(null, content)
+    }
+    return content
+  }
+
+  this.set = function (path, content) {
+    var unprefixedpath = this.removePrefix(path)
+    updateRefs(unprefixedpath, 'add')
+    var exists = storage.exists(unprefixedpath)
+    if (!storage.set(unprefixedpath, content)) {
+      return false
+    }
+    if (!exists) {
+      event.trigger('fileAdded', [this.type + '/' + unprefixedpath, false])
+    } else {
+      event.trigger('fileChanged', [this.type + '/' + unprefixedpath])
+    }
+    return true
+  }
+
+  this.addReadOnly = function (path, content) {
+    return this.set(path, content)
+  }
+
+  this.isReadOnly = function (path) {
+    return false
+  }
+
+  this.remove = function (path) {
+    var unprefixedpath = this.removePrefix(path)
+    updateRefs(unprefixedpath, 'remove')
+    if (!this._exists(unprefixedpath)) {
+      return false
+    }
+    if (!storage.remove(unprefixedpath)) {
+      return false
+    }
+    event.trigger('fileRemoved', [this.type + '/' + unprefixedpath])
+    return true
+  }
+
+  this.rename = function (oldPath, newPath, isFolder) {
+    var unprefixedoldPath = this.removePrefix(oldPath)
+    var unprefixednewPath = this.removePrefix(newPath)
+    updateRefs(unprefixedoldPath, 'remove')
+    updateRefs(unprefixednewPath, 'add')
+    if (storage.exists(unprefixedoldPath)) {
+      if (!storage.rename(unprefixedoldPath, unprefixednewPath)) {
+        return false
+      }
+      event.trigger('fileRenamed', [this.type + '/' + unprefixedoldPath, this.type + '/' + unprefixednewPath, isFolder])
+      return true
+    }
+    return false
+  }
+
+  this.resolveDirectory = function (path, callback) {
+    var self = this
+    if (path[0] === '/') path = path.substring(1)
+    if (!path) return callback(null, { [self.type]: { } })
+    var tree = {}
+    path = self.removePrefix(path)
+
+    var split = path.split('/') // this should be unprefixed path
+    var crawlpath = self.tree
+    split.forEach((pathPart, index) => {
+      if (crawlpath[pathPart]) crawlpath = crawlpath[pathPart]
+    })
+
+    for (var item in crawlpath) {
+      tree[item] = { isDirectory: typeof crawlpath[item] !== 'string' }
+    }
+    callback(null, tree)
+  }
+
+  this.removePrefix = function (path) {
+    path = path.indexOf(this.type) === 0 ? path.replace(this.type, '') : path
+    if (path[0] === '/') return path.substring(1)
+    return path
+  }
+}
+
+module.exports = FilesTree