## FAQ - Plug-in

### What is a plug-in?

Extension function
  It is a function which can add afterwards. In Metasequoia, a plug-in is provided as a DLL file (Windows) or a dylib file (macOS). Some default functions like [Create text] are implemented as plug-ins.
  As Developing kit(SDK) is open to the public, you can make your own plug-ins if you have programming knowledge on C++ and Windows/macOS.

### Where can I get plug-ins?

See the Metasequoia official web site.
  Some links to plug-ins which users made are connected in the official web site. Many other plug-ins are also open to the public.

### How can I develop a plug-in?

Get a plug-in SDK
  You can download the plug-in SDK from the official web site.
  Visual Studio (for Windows) or Xcode (for macOS) is also necessary for developing a plug-in.

### A plug-in cannot work.

Serial ID has not registered.
  Using plug-in is limited only to import files if serial ID has not registered. It is necessary for purchasing the license to use plug-ins.
Platform (Windows 32bit, Windows 64bit or macOS) is not matched.
  Metasequoia provides for each platform; Windows 32bit, Windows 64bit and macOS(Intel/Apple Silicon), and a plug-in must be matched with the platform.
It has not installed correctly.
  See the document attached to the plug-in if it exists when you want to know how to install the plug-in. If there is not any specific instructions, press the [install] button on the screen shown by [Menu > Help > About Plug-ins] and select the plug-in DLL.

### I want to use plug-ins for Metasequoia Ver.3.1.

Install Metasequoia 4 (32bit).
  All plug-ins for Metasequoia Ver3.1 or older are 32bit platform.
  But, some plug-ins for Ver3.1 cannot work on Metasequoia 4.