Windows API sets

All versions of Windows 10 share a common base of OS components that is called the core OS (in some contexts this common base is also called OneCore). In core OS components, Win32 APIs are organized into functional groups called API sets.

The purpose of an API set is to provide an architectural separation from the host DLL in which a given Win32 API is implemented and the functional contract to which the API belongs. The decoupling that API sets provide between implementation and contracts offers many engineering advantages for developers. In particular, using API sets in your code can improve compatibility with all Windows 10 devices.

API sets specifically address the following scenarios:

Although the full breadth of the Win32 API is supported on PCs, only a subset of the Win32 API is available on other Windows 10 devices such as HoloLens, Xbox, and other devices running Windows 10x. The API set name provides a query mechanism to cleanly detect whether an API is available on any given device.

Some Win32 API implementations exist in DLLs with different names across different Windows 10 devices. Using API set names instead of DLL names when detecting API availability and delay loading APIs provide a correct route to the implementation no matter where the API is actually implemented.

Linking to umbrella libraries

To make it easier to restrict your code to Win32 APIs that are supported in the core OS, we provide a series of umbrella libraries. For example, an umbrella library named OneCore.lib provides the exports for the subset of Win32 APIs that are common to all Windows 10 devices.

The APIs in an umbrella library may be implemented across a range of modules. The umbrella library abstracts those details away from you, making your code more portable across Windows 10 versions and devices. Instead of linking to libraries such as kernel32.lib and advapi32.lib, simply link your desktop app or driver with the umbrella library that contains the set of core OS APIs that you’re interested in.

API set contract names

API sets are identified by a strong contract name that follows these standard conventions recognized by the library loader.

• The name must begin either with the string api- or ext-.
  • Names that begin with api- represent APIs that are guaranteed to exist on all Windows 10 versions.
  • Names that begin with ext- represent APIs that may not exist on all Windows 10 versions.
• The name must end with the sequence l — — , where n consists of decimal digits.
• The body of the name can be alphanumeric characters, or dashes (—).
• The name is case insensitive.

Here are some examples of API set contract names:

• api-ms-win-core-ums-l1-1-0
• ext-ms-win-com-ole32-l1-1-5
• ext-ms-win-ntuser-window-l1-1-0
• ext-ms-win-ntuser-window-l1-1-1

You can use an API set name in the context of a loader operation such as LoadLibrary or P/Invoke instead of a DLL module name to ensure a correct route to the implementation no matter where the API is actually implemented on the current device. However, when you do this you must append the string .dll at the end of the contract name. This is a requirement of the loader to function properly, and is not considered actually a part of the contract name. Although contract names appear similar to DLL names in this context, they are fundamentally different from DLL module names and do not directly refer to a file on disk.

Except for appending the string .dll in loader operations, API set contract names should be considered an immutable identifier that corresponds to a specific contract version.

Identifying API sets for Win32 APIs

To identify whether a particular Win32 API belongs to an API set, review the requirements table in the reference documentation for the API. If the API belongs to an API set, the requirements table in the article lists the API set name and the Windows version in which the API was first introduced to the API set. For examples of APIs that belong to an API set, see these articles:

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Download Api.dll for Windows 10, 8.1, 8, 7, Vista and XP

What is Api.dll? What Does It Do? link

The Api.dll library is 1.23 MB. The download links are current and no negative feedback has been received by users. It has been downloaded 48175 times since release and it has received 3.5 out of 5 stars.

Table of Contents

Operating Systems Compatible with the Api.dll Library link

All Versions of the Api.dll Library link

The last version of the Api.dll library is the 10.0.61637.0 version. There have been 5 versions previously released. All versions of the Dynamic link library are listed below from newest to oldest.

How to Download Api.dll Library? link

1. First, click the «Download» button with the green background (The button marked in the picture). Step 1:Download the Api.dll library
2. After clicking the «Download» button at the top of the page, the «Downloading» page will open up and the download process will begin. Definitely do not close this page until the download begins. Our site will connect you to the closest DLL Downloader.com download server in order to offer you the fastest downloading performance. Connecting you to the server can take a few seconds.

How to Install Api.dll? How to Fix Api.dll Errors? link

ATTENTION! Before beginning the installation of the Api.dll library, you must download the library. If you don’t know how to download the library or if you are having a problem while downloading, you can look at our download guide a few lines above.

Method 1: Fixing the DLL Error by Copying the Api.dll Library to the Windows System Directory link

1. The file you will download is a compressed file with the «.zip» extension. You cannot directly install the «.zip» file. Because of this, first, double-click this file and open the file. You will see the library named «Api.dll» in the window that opens. Drag this library to the desktop with the left mouse button. This is the library you need. Step 1:Extracting the Api.dll library from the .zip file
2. Copy the «Api.dll» library file you extracted.
3. Paste the dynamic link library you copied into the «C:\Windows\System32» directory. Step 3:Pasting the Api.dll library into the Windows/System32 directory
4. If your system is 64 Bit, copy the «Api.dll» library and paste it into «C:\Windows\sysWOW64» directory.

NOTE! On 64 Bit systems, you must copy the dynamic link library to both the «sysWOW64» and «System32» directories. In other words, both directories need the «Api.dll» library.

NOTE! We ran the Command Prompt on Windows 10. If you are using Windows 8.1, Windows 8, Windows 7, Windows Vista or Windows XP, you can use the same methods to run the Command Prompt as an administrator.

1. Open the Start Menu and type in «cmd«, but don’t press Enter. Doing this, you will have run a search of your computer through the Start Menu. In other words, typing in «cmd» we did a search for the Command Prompt.
2. When you see the «Command Prompt» option among the search results, push the «CTRL» + «SHIFT» + «ENTER » keys on your keyboard.
3. A verification window will pop up asking, «Do you want to run the Command Prompt as with administrative permission?» Approve this action by saying, «Yes«.

Step 5:Running the Command Prompt with administrative permission

Let’s copy the command below and paste it in the Command Line that comes up, then let’s press Enter. This command deletes the Api.dll library’s problematic registry in the Windows Registry Editor(The library that we copied to the System32 directory does not perform any action with the library, it just deletes the registry in the Windows Registry Editor. The library that we pasted into the System32 directory will not be damaged).

Method 2: Copying The Api.dll Library Into The Program Installation Directory link

1. First, you must find the installation directory of the program (the program giving the dll error) you are going to install the dynamic link library to. In order to find this directory, «Right-Click > Properties» on the program’s shortcut. Step 1:Opening the program’s shortcut properties window
2. Open the program installation directory by clicking the Open File Location button in the «Properties» window that comes up. Step 2:Finding the program’s installation directory
3. Copy the Api.dll library.
4. Paste the dynamic link library you copied into the program’s installation directory that we just opened. Step 3:Pasting the Api.dll library into the program’s installation directory
5. When the dynamic link library is moved to the program installation directory, it means that the process is completed. Check to see if the issue was fixed by running the program giving the error message again. If you are still receiving the error message, you can complete the 3rd Method as an alternative.

Method 3: Uninstalling and Reinstalling the Program that Gives You the Api.dll Error link

1. Push the «Windows» + «R» keys at the same time to open the Run window. Type the command below into the Run window that opens up and hit Enter. This process will open the «Programs and Features» window.

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Method 4: Fixing the Api.dll Error Using the Windows System File Checker link

1. First, we must run the Windows Command Promptas an administrator.

NOTE! We ran the Command Prompt on Windows 10. If you are using Windows 8.1, Windows 8, Windows 7, Windows Vista or Windows XP, you can use the same methods to run the Command Prompt as an administrator.

1. Open the Start Menu and type in «cmd«, but don’t press Enter. Doing this, you will have run a search of your computer through the Start Menu. In other words, typing in «cmd» we did a search for the Command Prompt.
2. When you see the «Command Prompt» option among the search results, push the «CTRL» + «SHIFT» + «ENTER » keys on your keyboard.
3. A verification window will pop up asking, «Do you want to run the Command Prompt as with administrative permission?» Approve this action by saying, «Yes«.

Step 1:Running the Command Prompt with administrative permission

Paste the command below into the Command Line that opens up and hit the Enter key.

Method 5: Getting Rid of Api.dll Errors by Updating the Windows Operating System link

Some programs need updated dynamic link libraries. When your operating system is not updated, it cannot fulfill this need. In some situations, updating your operating system can solve the dll errors you are experiencing.

In order to check the update status of your operating system and, if available, to install the latest update packs, we need to begin this process manually.

Depending on which Windows version you use, manual update processes are different. Because of this, we have prepared a special article for each Windows version. You can get our articles relating to the manual update of the Windows version you use from the links below.

steam_api.dll

Независимо, приобретаете ли вы только лицензионные игры или скачиваете взломанные, на вашем пути может оказаться проблема, когда ДЛЛ библиотека создает проблему в виде ошибки файла steam_api.dll. Этот динамически подключаемый файл х32-64 бит обеспечивает взаимодействие непосредственно софта Steam и компьютерной игры. Потому, в некоторых случаях система выдает сообщения об неполадках типа: «Точка входа в процедуру steamuserstats не найдена. » или подобные.

Причиной, почему программа так себя ведет, может стать удаление, помещение в карантин, а также произошедшие изменения в связи с вмешательством стороннего приложения. В любом из указанных случаев, от этих ошибок можно избавиться.

Методы исправления ошибки файла steam api dll:

• если вы – скачали контент с приставкой Repack – взгляните на содержание карантина антивируса. Может статься, там есть Dll – тогда кликните его и «Разрешите элемент»;
• если у вас – лицензионный контент – переустановите неисправную игру, предварительно проверив содержимое компьютера антивирусным ПО;
• удалите клиент Steam, перейдя на Панель управления /Установка и удаление программ, с последующей переустановкой;
• скачать steam api dll для Windows 7/8/10 в интернете, поместить в папки Windows\System32 или Windows\SysWOW64, запустить через командную строку и перезагрузить компьютер.

Использование этих способов с 99% вероятностью решит ваши проблемы со входом в игру. Заметим лишь, что просто скачать steam api dll – наименее безопасный из методов, так как уверенности в том, что вы скачиваете именно нужный вам dll файл, нет. Отсутствие вируса или даже просто повреждений в таком файле вам никто не гарантирует.