.act file: how to open it on Windows

3 Windows apps register the .act extension. Install one of them to open the file with a double-click.

• 
  Namida

  A Beautiful and Feature-rich Music & Video Player with YouTube Support, Built in Flutter

  Proprietary 7.1.2 ★ 6.7K
• 
  MyuneMusic

  一个基于 Flutter (Dart) 实现的简易本地音乐播放器。

  Open source 0.9.5 ★ 497
• C
  Cyotek Color Palette Editor

  Cyotek Palette Editor allows you to create and work with colour palettes, in a variety of formats such as JASC, GIMP and Adobe Photoshop.

  Free 1.7.0.411

Related guide: Change the default app for a file type in Windows