Further testing discovered the registry key is actually unnecessary.

Author: riggs

Demos/Device/LowLevel/WebUSB/Config/AppConfig.h

@@ -49,8 +49,6 @@
 	#define WEBUSB_LANDING_PAGE_INDEX 0
 
 	#define MS_OS_20_VENDOR_CODE 0x45     // Must be different than WEBUSB_VENDOR_CODE
-	#define MS_OS_20_DESCRIPTOR_SET_TOTAL_LENGTH (10 + 20 + 132)
-	// python -c "import uuid;print('u\"{' + str(uuid.uuid4()) + '}\\\0\"')"
-	#define MS_OS_20_DEVICE_GUID_STRING_OF_STRING u"{94e78d93-4cbb-481f-b542-a74740d3a713}\0"    // FIXME: Generate a unique GUID for your device.
+	#define MS_OS_20_DESCRIPTOR_SET_TOTAL_LENGTH (10 + 20)
 
 #endif

Demos/Device/LowLevel/WebUSB/Descriptors.h

@@ -68,7 +68,6 @@
 		{
 			MS_OS_20_Descriptor_Set_Header_t        Header;
 			MS_OS_20_CompatibleID_Descriptor        CompatibleID;
-			MS_OS_20_Registry_Property_Descriptor   RegistryData;
 		} MS_OS_20_Descriptor_t;
 
 		/** Enum for the device interface descriptor IDs within the device. Each interface descriptor

Demos/Device/LowLevel/WebUSB/MS_OS_20_Device.h

@@ -42,7 +42,7 @@
 		/* $ python -c "import uuid;print(', '.join(map(hex, uuid.UUID('D8DD60DF-4589-4CC7-9CD2-659D9E648A9F').bytes_le)))" */
 		#define MS_OS_20_PLATFORM_UUID 0xdf, 0x60, 0xdd, 0xd8, 0x89, 0x45, 0xc7, 0x4c, 0x9c, 0xd2, 0x65, 0x9d, 0x9e, 0x64, 0x8a, 0x9f
 
-		#define MS_OS_20_WINDOWS_VERSION CPU_TO_LE32(0x06030000) // Windows version (8.1)
+		#define MS_OS_20_WINDOWS_VERSION 0x06030000 // Windows version (8.1)
 
 		#define MS_OS_20_ALTERNATE_ENUMERATION_CODE 0 /**< Set to non-zero to enable Windows to allow device to return alternate USB descriptors. */
 
@@ -153,10 +153,6 @@
 		/** \brief Microsoft OS 2.0 Registry Property Descriptor.
 		 *
 		 *  This descriptor is used to add per-device or per-function registry values that is read by the Windows USB driver stack or the device’s function driver.
-		 *
-		 *  For WebUSB in Chrome, for a single interface, we need to create a registry key DeviceInterfaceGUIDs of type REG_MULTI_SZ
-		 *  and a value of a GUID. For more information, see:
-		 *  https://github.com/pbatard/libwdi/wiki/WCID-Devices#defining-a-device-interface-guid-or-other-device-specific-properties
 		 */
 		typedef struct {
 			uint16_t Length; /**< The length in bytes of is descriptor. */

Demos/Device/LowLevel/WebUSB/WebUSB.c

@@ -136,17 +136,6 @@ const MS_OS_20_Descriptor_t PROGMEM MS_OS_20_Descriptor =
 			.DescriptorType = CPU_TO_LE16(MS_OS_20_FEATURE_COMPATBLE_ID),
 			.CompatibleID = u8"WINUSB\x00", // Automatically null-terminated to 8 bytes
 			.SubCompatibleID = {0, 0, 0, 0, 0, 0, 0, 0}
-		},
-
-	.RegistryData =
-		{
-			.Length = CPU_TO_LE16(10 + 42 + 80),
-			.DescriptorType = CPU_TO_LE16(MS_OS_20_FEATURE_REG_PROPERTY),
-			.PropertyDataType = CPU_TO_LE16(MS_OS_20_REG_MULTI_SZ),
-			.PropertyNameLength = CPU_TO_LE16(sizeof(MS_OS_20_REGISTRY_KEY)),
-			.PropertyName = MS_OS_20_REGISTRY_KEY, // 42 bytes
-			.PropertyDataLength = CPU_TO_LE16(sizeof(MS_OS_20_DEVICE_GUID_STRING_OF_STRING)),
-			.PropertyData = MS_OS_20_DEVICE_GUID_STRING_OF_STRING // 80 bytes
 		}
 };