Check Supported WGL extensions.

checkwglextensions.cpp

// Semi not so important stuff
// You won't see a window popup. It runs and exits.
// The extension string is written to working directory/supported.txt.
// If it fails after the window is created, it'll write the error there too.
// If it fails before window creation, there'll be no indication.
//
// Needs to be linked against opengl32.lib
// Needs wglext.h from https://www.opengl.org/registry/ placed in gl folder

#define _CRT_SECURE_NO_WARNINGS
#define WIN32_LEAN_AND_MEAN

#include <tchar.h>
#include <windows.h>
#include <GL/GL.h>
#include <stdio.h>

#include "GL/wglext.h"

HDC SetupDC(HWND hwnd, FILE *fp)
{
	PIXELFORMATDESCRIPTOR pfd;

	ZeroMemory(&pfd, sizeof(pfd));
	pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
	pfd.nVersion = 1;
	pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
	pfd.iPixelType = PFD_TYPE_RGBA;
	pfd.cColorBits = 32;
	pfd.cDepthBits = 24;
	pfd.cStencilBits = 8;
	pfd.iLayerType = PFD_MAIN_PLANE;

	if (HDC hdc = GetDC(hwnd)) {
		if (int pixel_format = ChoosePixelFormat(hdc, &pfd))
			if (SetPixelFormat(hdc, pixel_format, &pfd))
				return hdc;
			else
				fputs("SetPixelFormat failed\n", fp);
		else
			fputs("ChoosePixelFormat failed\n", fp);
		ReleaseDC(hwnd, hdc);
	} else {
		fputs("GetDC failed\n", fp);
	}

	return NULL;
}

void WriteSupportedWGLExtensions(HWND hwnd)
{
	FILE *fp = fopen("supported.txt", "w");
	if (fp == NULL)
		return;

	if (HDC hdc = SetupDC(hwnd, fp)) {
		if (HGLRC hglrc = wglCreateContext(hdc)) {
			wglMakeCurrent(hdc, hglrc);
			if (PFNWGLGETEXTENSIONSSTRINGARBPROC wglGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)wglGetProcAddress("wglGetExtensionsStringARB"))
				fprintf(fp, "%s\n", wglGetExtensionsStringARB(hdc));
			else
				fputs("wglGetExtensionsStringARB not found", fp);
			wglMakeCurrent(NULL, NULL);
			wglDeleteContext(hglrc);
		} else {
			fputs("wglCreateContext Failed\n", fp);
		}
		ReleaseDC(hwnd, hdc);
	}
	fclose(fp);
}

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
{
	WNDCLASS wc;
	ZeroMemory(&wc, sizeof(wc));
	wc.style = CS_OWNDC;
	wc.lpfnWndProc = DefWindowProc;
	wc.hInstance = hInstance;
	wc.lpszMenuName = NULL;
	wc.lpszClassName = TEXT("OpenGLTest");

	if (RegisterClass(&wc))
		if (HWND hwnd = CreateWindow(wc.lpszClassName, TEXT("OpenGL Test"), 0, 30, 30, 30, 30, NULL, NULL, hInstance, NULL)) {
			WriteSupportedWGLExtensions(hwnd);
			DestroyWindow(hwnd);
		}

	return 0;
}