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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteA Windows Script Component (WSC) is a script-based COM component: it exposes methods that another application can call through COM. Windows Script Host (WSH), by contrast, runs scripts. Microsoft’s IIS documentation describes WSCs as a way to build COM components with VBScript and compatible scripting languages, including for use by ASP applications. Microsoft’s WSC overview
What a Windows Script Component does
A WSC lets a script supply a component interface for a COM-aware caller. Rather than running as a standalone script, it is used by an application in much the same way as another COM component. Microsoft presents WSCs as useful for prototyping COM components, and describes using them from applications such as ASP.
The technology has three parts, according to Microsoft’s IIS documentation:
- Script component runtime:
Scrobj.dll, which supports the script component. - Interface handlers: compiled components that extend the runtime and make component interfaces available to callers.
- Script component file: an
.sctfile that identifies an interface handler and defines the methods exposed to an application.
The Automation interface handler is the one Microsoft identifies for calling a script component from an .asp file. The component’s usefulness therefore depends on the caller and handler being compatible with the interface it exposes.
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How WSC differs from Windows Script Host
The names are similar, but the roles are different. WSC is a way to implement a COM component in script; WSH is an environment for executing scripts. Microsoft documents two WSH hosts: WScript.exe for desktop script execution and CScript.exe for command-prompt execution. See Microsoft’s Windows Script Host overview.
Scripts can also use COM objects. Microsoft’s COM usage guidance shows VBScript using CreateObject(), and JScript using ActiveXObject or WScript.CreateObject(). That is distinct from creating a WSC: in one case a script obtains and uses an object; in the other, a script defines a component for a compatible application to call.
Rank #2
| Technology | Role | Typical relationship |
|---|---|---|
| Windows Script Component (WSC) | Defines a script-based COM component and its callable methods. | A compatible application, such as an ASP page, calls the component through its interface. |
| Windows Script Host (WSH) | Runs scripts through a Windows host. | A user or process launches a script with WScript.exe or CScript.exe. |
How the component is called and registered
The WSC file specifies the handler and the methods an application can invoke. For the ASP scenario in Microsoft’s documentation, the Automation interface handler provides the calling route. This is not a general instruction to register every WSC in the same way: Microsoft’s archived IIS guidance says Component Services registration is relevant when transaction participation or the Component Services runtime environment is required.
That registration advice comes from historical IIS documentation and should be read in that context, not as a current deployment recommendation. The cited material does not establish which authoring or deployment tools are available on every present-day Windows release.
What current Windows documentation does—and does not—confirm
Microsoft’s current wscript command reference documents options for the WSH command, including selecting a script engine for a custom file extension and setting a maximum run time. Its applicability list includes Windows 10, Windows 11, and specified Windows Server releases. That confirms information about the wscript command; it does not establish that WSC authoring, deployment tooling, or the WSC runtime is currently supported or included across those releases.
The WSC overview cited here is archived IIS documentation, last updated June 15, 2017. The available sources do not resolve WSC’s current support lifecycle or the present availability of its tools. Treat the architectural description as historical technical documentation and verify the requirements of any specific legacy application before planning a deployment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When WSC may be relevant
WSC is mainly relevant when maintaining or understanding software that expects a script-backed COM component, or when studying Microsoft’s historical approach to COM prototyping with scripting languages. It is not interchangeable with a standalone WSH script: the required caller, exposed interface, handler, and runtime environment all matter. Microsoft’s documentation does not provide current performance comparisons with compiled COM components, so it does not support claims that WSC is faster, slower, or preferable for modern development.
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