diff --git a/app/build.gradle b/app/build.gradle
index 01299cf2..b63c2e8c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -43,7 +43,7 @@ dependencies {
     compile 'com.android.support:design:23.4.0'
     compile 'com.jakewharton:butterknife:8.0.1'
     compile 'com.github.bumptech.glide:glide:3.7.0'
-    compile 'com.simplemobiletools:filepicker:1.3.12@aar'
+    compile 'com.simplemobiletools:filepicker:1.3.15@aar'
     compile 'com.simplemobiletools:fileproperties:1.0.2@aar'
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 
diff --git a/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/editText.kt b/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/editText.kt
deleted file mode 100644
index 6fe8bbc0..00000000
--- a/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/editText.kt
+++ /dev/null
@@ -1,5 +0,0 @@
-package com.simplemobiletools.filemanager.extensions
-
-import android.widget.EditText
-
-val EditText.value: String get() = this.text.toString().trim()
diff --git a/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/resources.kt b/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/resources.kt
deleted file mode 100644
index 156bd497..00000000
--- a/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/resources.kt
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.simplemobiletools.filemanager.extensions
-
-import android.content.res.Resources
-import android.graphics.*
-
-fun Resources.getColoredIcon(colorId: Int, resId: Int): Bitmap {
-    val options = BitmapFactory.Options()
-    options.inMutable = true
-    val bitmap = BitmapFactory.decodeResource(this, resId, options)
-    val paint = Paint()
-    val filter = PorterDuffColorFilter(getColor(colorId), PorterDuff.Mode.SRC_IN)
-    paint.colorFilter = filter
-    val canvas = Canvas(bitmap)
-    canvas.drawBitmap(bitmap, 0f, 0f, paint)
-    return bitmap
-}
diff --git a/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/string.kt b/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/string.kt
deleted file mode 100644
index 9e95e1d9..00000000
--- a/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/string.kt
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.simplemobiletools.filemanager.extensions
-
-import java.util.regex.Pattern
-
-fun String.isValidFilename(): Boolean {
-    val pattern = Pattern.compile("^[-_.A-Za-z0-9()#& ]+$")
-    val matcher = pattern.matcher(this)
-    return matcher.matches()
-}
diff --git a/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/textView.kt b/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/textView.kt
deleted file mode 100644
index 44eba86e..00000000
--- a/app/src/main/kotlin/com/simplemobiletools/filemanager/extensions/textView.kt
+++ /dev/null
@@ -1,5 +0,0 @@
-package com.simplemobiletools.filemanager.extensions
-
-import android.widget.TextView
-
-val TextView.value: String get() = this.text.toString().trim()