Add CWindowsComLifecycle RAII wrapper for Windows COM library

src/base/system.cpp

@@ -65,6 +65,7 @@
 
 #include <cerrno>
 #include <io.h>
+#include <objbase.h>
 #include <process.h>
 #include <share.h>
 #include <shellapi.h>
@@ -4199,6 +4200,17 @@ int net_socket_read_wait(NETSOCKET sock, std::chrono::nanoseconds nanoseconds)
 	return ::net_socket_read_wait(sock, (nanoseconds / std::chrono::nanoseconds(1us).count()).count());
 }
 
+#if defined(CONF_FAMILY_WINDOWS)
+CWindowsComLifecycle::CWindowsComLifecycle()
+{
+	CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
+}
+CWindowsComLifecycle::~CWindowsComLifecycle()
+{
+	CoUninitialize();
+}
+#endif
+
 size_t std::hash<NETADDR>::operator()(const NETADDR &Addr) const noexcept
 {
 	return std::hash<std::string_view>{}(std::string_view((const char *)&Addr, sizeof(Addr)));

src/base/system.h

@@ -2515,6 +2515,19 @@ public:
 	}
 };
 
+#if defined(CONF_FAMILY_WINDOWS)
+/**
+ * This is a RAII wrapper to initialize/uninitialize the Windows COM library,
+ * which may be necessary for using the open_file and open_link functions.
+ */
+class CWindowsComLifecycle
+{
+public:
+	CWindowsComLifecycle();
+	~CWindowsComLifecycle();
+};
+#endif
+
 /**
  * Copies a string to a fixed-size array of chars.
  *

src/engine/client/client.cpp

@@ -4561,6 +4561,8 @@ int main(int argc, const char **argv)
 {
 #if defined(CONF_PLATFORM_ANDROID)
 	const char **argv = const_cast<const char **>(argv2);
+#elif defined(CONF_FAMILY_WINDOWS)
+	CWindowsComLifecycle WindowsComLifecycle;
 #endif
 	CCmdlineFix CmdlineFix(&argc, &argv);
 	bool Silent = false;