Index: src/OFSystemInfo.h
==================================================================
--- src/OFSystemInfo.h
+++ src/OFSystemInfo.h
@@ -35,10 +35,13 @@
 @property (class, readonly, nonatomic) unsigned short ObjFWVersionMajor;
 @property (class, readonly, nonatomic) unsigned short ObjFWVersionMinor;
 @property (class, readonly, nullable, nonatomic) OFString *operatingSystemName;
 @property (class, readonly, nullable, nonatomic)
     OFString *operatingSystemVersion;
+#if defined(OF_WINDOWS) || defined(DOXYGEN)
+@property (class, readonly, nullable, nonatomic) OFString *wineVersion;
+#endif
 @property (class, readonly, nullable, nonatomic) OFIRI *userDataIRI;
 @property (class, readonly, nullable, nonatomic) OFIRI *userConfigIRI;
 @property (class, readonly, nullable, nonatomic) OFIRI *temporaryDirectoryIRI;
 @property (class, readonly, nullable, nonatomic) OFString *CPUVendor;
 @property (class, readonly, nullable, nonatomic) OFString *CPUModel;
@@ -144,10 +147,23 @@
  *	  running on.
  *
  * @return The version of the operating system the application is running on
  */
 + (nullable OFString *)operatingSystemVersion;
+
+#if defined(OF_WINDOWS) || defined(DOXYGEN)
+/**
+ * @brief Returns the version of Wine the application is running on, or `nil`
+ *	  if not running on Wine (e.g. on Windows natively).
+ *
+ * @note This is only available on Windows.
+ *
+ * @return The version of Wine the application is running on, or `nil` if not
+ *	   running on Wine (e.g. on Windows natively)
+ */
++ (nullable OFString *)wineVersion;
+#endif
 
 /**
  * @brief Returns the path where user data for the application can be stored.
  *
  * On UNIX systems, this adheres to the XDG Base Directory specification.@n

Index: src/OFSystemInfo.m
==================================================================
--- src/OFSystemInfo.m
+++ src/OFSystemInfo.m
@@ -156,10 +156,14 @@
 
 static size_t pageSize = 4096;
 static size_t numberOfCPUs = 1;
 static OFString *operatingSystemName = nil;
 static OFString *operatingSystemVersion = nil;
+
+#ifdef OF_WINDOWS
+static const char *(*wine_get_version)(void);
+#endif
 
 static void
 initOperatingSystemName(void)
 {
 #if defined(OF_IOS)
@@ -389,14 +393,20 @@
 	 */
 	SSETest();
 #endif
 
 #if defined(OF_WINDOWS)
+	HANDLE module;
+
 	SYSTEM_INFO si;
 	GetSystemInfo(&si);
 	pageSize = si.dwPageSize;
 	numberOfCPUs = si.dwNumberOfProcessors;
+
+	if ((module = GetModuleHandle("ntdll.dll")) != NULL)
+		wine_get_version = (const char *(*)(void))
+		    GetProcAddress(module, "wine_get_version");
 #elif defined(OF_QNX)
 	if ((tmp = sysconf(_SC_PAGESIZE)) > 0)
 		pageSize = tmp;
 	numberOfCPUs = _syspage_ptr->num_cpu;
 #else
@@ -456,10 +466,21 @@
 	static OFOnceControl onceControl = OFOnceControlInitValue;
 	OFOnce(&onceControl, initOperatingSystemVersion);
 
 	return operatingSystemVersion;
 }
+
+#ifdef OF_WINDOWS
++ (OFString *)wineVersion
+{
+	if (wine_get_version != NULL)
+		return [OFString stringWithCString: wine_get_version()
+					  encoding: [OFLocale encoding]];
+
+	return nil;
+}
+#endif
 
 + (OFIRI *)userDataIRI
 {
 #ifdef OF_HAVE_FILES
 # if defined(OF_MACOS) || defined(OF_IOS)

Index: tests/OFSystemInfoTests.m
==================================================================
--- tests/OFSystemInfoTests.m
+++ tests/OFSystemInfoTests.m
@@ -63,10 +63,13 @@
 	ADD(@"ObjFW version", [OFSystemInfo ObjFWVersion])
 	ADD_UINT(@"ObjFW version major", [OFSystemInfo ObjFWVersionMajor])
 	ADD_UINT(@"ObjFW version minor", [OFSystemInfo ObjFWVersionMinor])
 	ADD(@"Operating system name", [OFSystemInfo operatingSystemName]);
 	ADD(@"Operating system version", [OFSystemInfo operatingSystemVersion]);
+#ifdef OF_WINDOWS
+	ADD(@"Wine version", [OFSystemInfo wineVersion]);
+#endif
 	ADD_ULONGLONG(@"Page size", [OFSystemInfo pageSize]);
 	ADD_ULONGLONG(@"Number of CPUs", [OFSystemInfo numberOfCPUs]);
 	ADD(@"User config IRI", [OFSystemInfo userConfigIRI].string);
 	ADD(@"User data IRI", [OFSystemInfo userDataIRI].string);
 	ADD(@"Temporary directory IRI",