diff --git a/src/main/window.js b/src/main/window.js
index 017789f8..534b6863 100644
--- a/src/main/window.js
+++ b/src/main/window.js
@@ -190,10 +190,7 @@ class AppWindow {
     const unwatcher = this.watcher.watch(win, pathname)
     this.windows.get(win.id).watchers.push(unwatcher)
     try {
-      win.webContents.send('AGANI::open-project', {
-        name: path.basename(pathname),
-        pathname
-      })
+      win.webContents.send('AGANI::open-project', pathname)
     } catch (err) {
       log(err)
     }
diff --git a/src/renderer/components/sideBar/listFile.vue b/src/renderer/components/sideBar/listFile.vue
index 7f8ee36f..aeb5932d 100644
--- a/src/renderer/components/sideBar/listFile.vue
+++ b/src/renderer/components/sideBar/listFile.vue
@@ -19,8 +19,10 @@
 </template>
 
 <script>
+  import path from 'path'
   import { mapState } from 'vuex'
   import { fileMixins } from '../../mixins'
+  import { PATH_SEPARATOR } from '../../config'
 
   export default {
     mixins: [fileMixins],
@@ -36,14 +38,21 @@
         tabs: state => state.editor.tabs,
         currentFile: state => state.editor.currentFile
       }),
+
+      // Return filename without extension.
       filename () {
-        return this.file.name.split('.')[0]
+        return path.basename(this.file.name, path.extname(this.file.name))
       },
+
+      // Return the filename extension or null.
       extension () {
-        return `.${this.file.name.split('.')[1]}`
+        return path.extname(this.file.name)
       },
+
+      // Return the parent directory with trailing path separator.
+      //   NOTE: Parent from "Z:\" is "Z:\" on Windows!
       parent () {
-        return this.file.pathname.match(/(?:^|\/)([^/]+)\/[^/]+\.[^/]+$/)[1] + '/'
+        return path.join(path.dirname(this.file.pathname), PATH_SEPARATOR)
       }
     }
   }
diff --git a/src/renderer/components/titleBar.vue b/src/renderer/components/titleBar.vue
index f6268bd2..bb1ef7f1 100644
--- a/src/renderer/components/titleBar.vue
+++ b/src/renderer/components/titleBar.vue
@@ -82,6 +82,7 @@
   import { remote } from 'electron'
   import { mapState } from 'vuex'
   import { minimizePath, restorePath, maximizePath, closePath } from '../assets/window-controls.js'
+  import { PATH_SEPARATOR } from '../config'
 
   export default {
     data () {
@@ -134,7 +135,7 @@
       }),
       paths () {
         if (!this.pathname) return []
-        const pathnameToken = this.pathname.split('/').filter(i => i)
+        const pathnameToken = this.pathname.split(PATH_SEPARATOR).filter(i => i)
         return pathnameToken.slice(0, pathnameToken.length - 1).slice(-3)
       }
     },
diff --git a/src/renderer/config.js b/src/renderer/config.js
index caa5fd19..39102b0f 100644
--- a/src/renderer/config.js
+++ b/src/renderer/config.js
@@ -1,3 +1,7 @@
+import path from 'path'
+
+export const PATH_SEPARATOR = path.sep
+
 export const THEME_LINK_ID = 'ag-theme'
 export const COMMON_STYLE_ID = 'ag-common-style'
 
diff --git a/src/renderer/store/project.js b/src/renderer/store/project.js
index b65eaa34..47778f4d 100644
--- a/src/renderer/store/project.js
+++ b/src/renderer/store/project.js
@@ -3,6 +3,7 @@ import { ipcRenderer, shell } from 'electron'
 import { addFile, unlinkFile, changeFile, addDirectory, unlinkDirectory } from './treeCtrl'
 import bus from '../bus'
 import { create, paste, rename } from '../util/fileSystem'
+import { PATH_SEPARATOR } from '../config'
 import notice from '../services/notification'
 import { getFileStateFromData } from './help'
 
@@ -36,9 +37,17 @@ const getters = {
 }
 
 const mutations = {
-  SET_PROJECT_TREE (state, { pathname, name }) {
+  SET_PROJECT_TREE (state, pathname) {
+    let name = path.basename(pathname)
+    if (!name) {
+      // Root directory such "/" or "C:\"
+      name = pathname
+    }
+
     state.projectTree = {
-      pathname,
+      // Root full path
+      pathname: path.normalize(pathname),
+      // Root directory name
       name,
       isDirectory: true,
       isFile: false,
@@ -105,12 +114,12 @@ const mutations = {
 
 const actions = {
   LISTEN_FOR_LOAD_PROJECT ({ commit, dispatch }) {
-    ipcRenderer.on('AGANI::open-project', (e, { pathname, name }) => {
+    ipcRenderer.on('AGANI::open-project', (e, pathname) => {
       // Initialize editor and show empty/new tab
       dispatch('NEW_BLANK_FILE')
 
       dispatch('INIT_STATUS', true)
-      commit('SET_PROJECT_TREE', { pathname, name })
+      commit('SET_PROJECT_TREE', pathname)
       commit('SET_LAYOUT', {
         rightColumn: 'files',
         showSideBar: true,
@@ -189,7 +198,7 @@ const actions = {
       const { pathname, isDirectory } = state.activeItem
       const dirname = isDirectory ? pathname : path.dirname(pathname)
       if (clipboard) {
-        clipboard.dest = dirname + '/' + path.basename(clipboard.src)
+        clipboard.dest = dirname + PATH_SEPARATOR + path.basename(clipboard.src)
         paste(clipboard)
           .then(() => {
             commit('SET_CLIPBOARD', null)
@@ -232,7 +241,7 @@ const actions = {
   RENAME_IN_SIDEBAR ({ commit, state }, name) {
     const src = state.renameCache
     const dirname = path.dirname(src)
-    const dest = dirname + '/' + name
+    const dest = dirname + PATH_SEPARATOR + name
     rename(src, dest)
       .then(() => {
         commit('RENAME_IF_NEEDED', { src, dest })
diff --git a/src/renderer/store/treeCtrl.js b/src/renderer/store/treeCtrl.js
index 57977c26..c3d5eabd 100644
--- a/src/renderer/store/treeCtrl.js
+++ b/src/renderer/store/treeCtrl.js
@@ -1,34 +1,43 @@
 import path from 'path'
 import { getUniqueId } from '../util'
+import { PATH_SEPARATOR } from '../config'
 
-const pathSeparator = path.sep
-const isWindows = process.platform === 'win32'
-
-const getPathArr = (projectName, pathname) => {
-  const reUnix = /^\/+(.*)/
-  const reWindows = /^\\+(.*)/
-  let [prePath, partPath] = pathname.split(projectName)
-  partPath = partPath.replace(isWindows ? reWindows : reUnix, (_, p1) => p1)
-  prePath += projectName
-  const tokens = partPath ? partPath.split(pathSeparator) : []
-
-  return { prePath, tokens }
+/**
+ * Return all sub-directories relative to the root directory.
+ *
+ * @param {string} rootPath Root directory path
+ * @param {string} pathname Full directory path
+ * @returns {Array<string>} Sub-directories relative to root.
+ */
+const getSubdirectoriesFromRoot = (rootPath, pathname) => {
+  if (!path.isAbsolute(pathname)) {
+    throw new Error('Invalid path!')
+  }
+  const relativePath = path.relative(rootPath, pathname)
+  return relativePath ? relativePath.split(PATH_SEPARATOR) : []
 }
 
+/**
+ * Add a new file to the tree list.
+ *
+ * @param {*} tree Root file tree
+ * @param {*} file The file that should be added
+ */
 export const addFile = (tree, file) => {
   const { pathname, name } = file
   const dirname = path.dirname(pathname)
-  let { prePath, tokens } = getPathArr(tree.name, dirname)
-  let folder = tree
-  let folders = tree.folders
+  const subDirectories = getSubdirectoriesFromRoot(tree.pathname, dirname)
 
-  for (const token of tokens) {
-    let childFolder = folders.find(f => f.name === token)
+  let currentPath = tree.pathname
+  let currentFolder = tree
+  let currentSubFolders = tree.folders
+  for (const directoryName of subDirectories) {
+    let childFolder = currentSubFolders.find(f => f.name === directoryName)
     if (!childFolder) {
       childFolder = {
         id: getUniqueId(),
-        pathname: `${prePath}${pathSeparator}${token}`,
-        name: token,
+        pathname: `${currentPath}${PATH_SEPARATOR}${directoryName}`,
+        name: directoryName,
         isCollapsed: true,
         isDirectory: true,
         isFile: false,
@@ -36,30 +45,39 @@ export const addFile = (tree, file) => {
         folders: [],
         files: []
       }
-      folders.push(childFolder)
+      currentSubFolders.push(childFolder)
     }
-    prePath = `${prePath}${pathSeparator}${token}`
-    folder = childFolder
-    folders = childFolder.folders
+
+    currentPath = `${currentPath}${PATH_SEPARATOR}${directoryName}`
+    currentFolder = childFolder
+    currentSubFolders = childFolder.folders
   }
 
-  if (!folder.files.find(f => f.name === name)) {
+  // Add file to related directory
+  if (!currentFolder.files.find(f => f.name === name)) {
     file.id = getUniqueId()
-    folder.files.push(file)
+    currentFolder.files.push(file)
   }
 }
 
+/**
+ * Add a new directory to the tree list.
+ *
+ * @param {*} tree Root file tree
+ * @param {*} dir The directory that should be added
+ */
 export const addDirectory = (tree, dir) => {
-  let { prePath, tokens } = getPathArr(tree.name, dir.pathname)
-  let folders = tree.folders
+  const subDirectories = getSubdirectoriesFromRoot(tree.pathname, dir.pathname)
 
-  for (const token of tokens) {
-    let childFolder = folders.find(f => f.name === token)
+  let currentPath = tree.pathname
+  let currentSubFolders = tree.folders
+  for (const directoryName of subDirectories) {
+    let childFolder = currentSubFolders.find(f => f.name === directoryName)
     if (!childFolder) {
       childFolder = {
         id: getUniqueId(),
-        pathname: `${prePath}${pathSeparator}${token}`,
-        name: token,
+        pathname: `${currentPath}${PATH_SEPARATOR}${directoryName}`,
+        name: directoryName,
         isCollapsed: true,
         isDirectory: true,
         isFile: false,
@@ -67,70 +85,86 @@ export const addDirectory = (tree, dir) => {
         folders: [],
         files: []
       }
-      folders.push(childFolder)
+      currentSubFolders.push(childFolder)
     }
-    prePath = `${prePath}${pathSeparator}${token}`
-    folders = childFolder.folders
+
+    currentPath = `${currentPath}${PATH_SEPARATOR}${directoryName}`
+    currentSubFolders = childFolder.folders
   }
 }
 
+/**
+ * Remove the given file from the tree list.
+ *
+ * @param {*} tree Root file tree
+ * @param {*} file The file that should be deleted
+ */
 export const unlinkFile = (tree, file) => {
   const { pathname } = file
   const dirname = path.dirname(pathname)
-  let { tokens } = getPathArr(tree.name, dirname)
+  const subDirectories = getSubdirectoriesFromRoot(tree.pathname, dirname)
 
-  let folder = tree
-  let folders = tree.folders
-
-  for (const token of tokens) {
-    const childFolder = folders.find(f => f.name === token)
+  let currentFolder = tree
+  let currentSubFolders = tree.folders
+  for (const directoryName of subDirectories) {
+    const childFolder = currentSubFolders.find(f => f.name === directoryName)
     if (!childFolder) return
-    folder = childFolder
-    folders = childFolder.folders
+    currentFolder = childFolder
+    currentSubFolders = childFolder.folders
   }
 
-  const index = folder.files.findIndex(f => f.pathname === pathname)
-
-  if (index > -1) {
-    folder.files.splice(index, 1)
+  const index = currentFolder.files.findIndex(f => f.pathname === pathname)
+  if (index !== -1) {
+    currentFolder.files.splice(index, 1)
   }
 }
 
+/**
+ * Update a given file in the tree list.
+ *
+ * @param {*} tree Root file tree
+ * @param {*} file The file that was changed
+ */
 export const changeFile = (tree, file) => {
   const { pathname, data } = file
   const dirname = path.dirname(pathname)
-  let { tokens } = getPathArr(tree.name, dirname)
+  const subDirectories = getSubdirectoriesFromRoot(tree.pathname, dirname)
 
-  let folder = tree
-  let folders = tree.folders
-
-  for (const token of tokens) {
-    const childFolder = folders.find(f => f.name === token)
+  let currentFolder = tree
+  let currentSubFolders = tree.folders
+  for (const directoryName of subDirectories) {
+    const childFolder = currentSubFolders.find(f => f.name === directoryName)
     if (!childFolder) return
-    folder = childFolder
-    folders = childFolder.folders
+    currentFolder = childFolder
+    currentSubFolders = childFolder.folders
   }
 
-  const index = folder.files.findIndex(f => f.pathname === pathname)
-  folder.files[index].data = data
+  const index = currentFolder.files.findIndex(f => f.pathname === pathname)
+  if (index !== -1) {
+    currentFolder.files[index].data = data
+  }
 }
 
+/**
+ * Remove the given directory from the tree list.
+ *
+ * @param {*} tree Root file tree
+ * @param {*} dir The directory that should be deleted
+ */
 export const unlinkDirectory = (tree, dir) => {
   const { pathname } = dir
-  const { tokens } = getPathArr(tree.name, pathname)
+  const subDirectories = getSubdirectoriesFromRoot(tree.pathname, pathname)
 
-  tokens.pop()
-  let folders = tree.folders
-
-  for (const token of tokens) {
-    const childFolder = folders.find(f => f.name === token)
+  subDirectories.pop()
+  let currentFolder = tree.folders
+  for (const directoryName of subDirectories) {
+    const childFolder = currentFolder.find(f => f.name === directoryName)
     if (!childFolder) return
-    folders = childFolder.folders
+    currentFolder = childFolder.folders
   }
 
-  const index = folders.findIndex(f => f.pathname === pathname)
-
-  if (index > -1) {
-    folders.splice(index, 1)
+  const index = currentFolder.findIndex(f => f.pathname === pathname)
+  if (index !== -1) {
+    currentFolder.splice(index, 1)
   }
 }