diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index f810a9ba..549c691b 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -486,18 +486,6 @@ parameters:
 			count: 1
 			path: test/unit/Installing/InstallForPhpProject/InstallSelectedPackageTest.php
 
-		-
-			message: '#^Parameter \#1 \$filename of function file_exists expects string, string\|false given\.$#'
-			identifier: argument.type
-			count: 1
-			path: test/unit/Platform/TargetPhp/PhpBinaryPathTest.php
-
-		-
-			message: '#^Parameter \#1 \$filename of function is_dir expects string, string\|false given\.$#'
-			identifier: argument.type
-			count: 1
-			path: test/unit/Platform/TargetPhp/PhpBinaryPathTest.php
-
 		-
 			message: '#^Method Php\\PieUnitTest\\SelfManage\\Verify\\FallbackVerificationUsingOpenSslTest\:\:prepareCertificateAndSignature\(\) should return array\{string, string\} but returns array\{mixed, mixed\}\.$#'
 			identifier: return.type
diff --git a/src/Building/WindowsBuild.php b/src/Building/WindowsBuild.php
index 39bb2a1b..c724accf 100644
--- a/src/Building/WindowsBuild.php
+++ b/src/Building/WindowsBuild.php
@@ -26,10 +26,13 @@ public function __invoke(
     ): BinaryFile {
         $prebuiltDll = WindowsExtensionAssetName::determineDllName($targetPlatform, $downloadedPackage);
 
-        $io->write(sprintf(
-            '<info>Nothing to do on Windows, prebuilt DLL found:</info> %s',
-            $prebuiltDll,
-        ));
+        $io->write(
+            sprintf(
+                '<info>Nothing to build on Windows, prebuilt DLL found:</info> %s',
+                $prebuiltDll,
+            ),
+            verbosity: IOInterface::VERBOSE,
+        );
 
         return BinaryFile::fromFileWithSha256Checksum($prebuiltDll);
     }
diff --git a/src/Platform/TargetPhp/PhpBinaryPath.php b/src/Platform/TargetPhp/PhpBinaryPath.php
index 61216ccc..9f4a5579 100644
--- a/src/Platform/TargetPhp/PhpBinaryPath.php
+++ b/src/Platform/TargetPhp/PhpBinaryPath.php
@@ -107,18 +107,20 @@ public function extensionPath(): string
                 return $extensionPath;
             }
 
+            // `extension_dir` may be a relative URL on Windows, so resolve it according to the location of PHP
+            if (self::operatingSystem() === OperatingSystem::Windows) {
+                $phpPath              = dirname($this->phpBinaryPath);
+                $attemptExtensionPath = $phpPath . DIRECTORY_SEPARATOR . $extensionPath;
+
+                if (file_exists($attemptExtensionPath) && is_dir($attemptExtensionPath)) {
+                    return $attemptExtensionPath;
+                }
+            }
+
             // if the path is absolute, try to create it
             if (mkdir($extensionPath, 0777, true) && file_exists($extensionPath) && is_dir($extensionPath)) {
                 return $extensionPath;
             }
-
-            // `extension_dir` may be a relative URL on Windows, so resolve it according to the location of PHP
-            $phpPath              = dirname($this->phpBinaryPath);
-            $attemptExtensionPath = $phpPath . DIRECTORY_SEPARATOR . $extensionPath;
-
-            if (file_exists($attemptExtensionPath) && is_dir($attemptExtensionPath)) {
-                return $attemptExtensionPath;
-            }
         }
 
         throw new RuntimeException('Could not determine extension path for ' . $this->phpBinaryPath);
diff --git a/test/integration/Command/BuildCommandTest.php b/test/integration/Command/BuildCommandTest.php
index 7e8d7010..07123e58 100644
--- a/test/integration/Command/BuildCommandTest.php
+++ b/test/integration/Command/BuildCommandTest.php
@@ -31,7 +31,7 @@ public function testBuildCommandWillBuildTheExtension(): void
         $outputString = $this->commandTester->getDisplay();
 
         if (Platform::isWindows()) {
-            self::assertStringContainsString('Nothing to do on Windows', $outputString);
+            self::assertStringContainsString('Found prebuilt archive', $outputString);
 
             return;
         }
diff --git a/test/unit/Platform/TargetPhp/PhpBinaryPathTest.php b/test/unit/Platform/TargetPhp/PhpBinaryPathTest.php
index acd93e7f..064139e4 100644
--- a/test/unit/Platform/TargetPhp/PhpBinaryPathTest.php
+++ b/test/unit/Platform/TargetPhp/PhpBinaryPathTest.php
@@ -16,7 +16,9 @@
 use Php\Pie\Util\Process;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\RequiresOperatingSystemFamily;
 use PHPUnit\Framework\TestCase;
+use ReflectionMethod;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Process\PhpExecutableFinder;
 
@@ -35,11 +37,13 @@
 use function ini_get;
 use function is_dir;
 use function is_executable;
+use function mkdir;
 use function php_uname;
 use function phpversion;
 use function sprintf;
 use function strtolower;
 use function sys_get_temp_dir;
+use function trim;
 use function uniqid;
 
 use const DIRECTORY_SEPARATOR;
@@ -235,11 +239,28 @@ public function testPhpIntSize(): void
         );
     }
 
-    public function testExtensionPath(): void
+    #[RequiresOperatingSystemFamily('Linux')]
+    public function testExtensionPathOnLinuxThatAlreadyExists(): void
     {
         $phpBinary = PhpBinaryPath::fromCurrentProcess();
 
-        $expectedExtensionDir = ini_get('extension_dir');
+        $expectedExtensionDir = (string) ini_get('extension_dir');
+        self::assertNotEmpty($expectedExtensionDir);
+        self::assertDirectoryExists($expectedExtensionDir);
+
+        self::assertSame(
+            $expectedExtensionDir,
+            $phpBinary->extensionPath(),
+        );
+    }
+
+    #[RequiresOperatingSystemFamily('Windows')]
+    public function testExtensionPathOnWindows(): void
+    {
+        $phpBinary = PhpBinaryPath::fromCurrentProcess();
+
+        $expectedExtensionDir = (string) ini_get('extension_dir');
+        self::assertNotEmpty($expectedExtensionDir);
 
         // `extension_dir` may be a relative URL on Windows (e.g. "ext"), so resolve it according to the location of PHP
         if (! file_exists($expectedExtensionDir) || ! is_dir($expectedExtensionDir)) {
@@ -255,9 +276,32 @@ public function testExtensionPath(): void
         );
     }
 
+    #[RequiresOperatingSystemFamily('Windows')]
+    public function testRelativeExtensionPathOnWindowsIsFilled(): void
+    {
+        $phpBinary = $this->createPartialMock(PhpBinaryPath::class, ['phpinfo']);
+        (new ReflectionMethod($phpBinary, '__construct'))
+            ->invoke($phpBinary, trim((string) (new PhpExecutableFinder())->find()), null);
+
+        $configuredExtensionPath = 'foo';
+        self::assertDirectoryDoesNotExist($configuredExtensionPath, 'test cannot run if the same-named extension dir already exists in cwd');
+
+        $fullExtensionPath = dirname($phpBinary->phpBinaryPath) . DIRECTORY_SEPARATOR . $configuredExtensionPath;
+        mkdir($fullExtensionPath, 0777, true);
+        self::assertDirectoryExists($fullExtensionPath);
+
+        $phpBinary->expects(self::once())
+            ->method('phpinfo')
+            ->willReturn(sprintf('extension_dir => %s => %s', $configuredExtensionPath, $configuredExtensionPath));
+
+        self::assertSame($fullExtensionPath, $phpBinary->extensionPath());
+    }
+
     public function testExtensionPathIsImplicitlyCreated(): void
     {
         $phpBinary = $this->createPartialMock(PhpBinaryPath::class, ['phpinfo']);
+        (new ReflectionMethod($phpBinary, '__construct'))
+            ->invoke($phpBinary, trim((string) (new PhpExecutableFinder())->find()), null);
 
         $configuredExtensionPath = sys_get_temp_dir() . DIRECTORY_SEPARATOR . uniqid('PIE_non_existent_extension_path', true);
         self::assertDirectoryDoesNotExist($configuredExtensionPath);