diff --git a/code/nel/src/misc/common.cpp b/code/nel/src/misc/common.cpp
index 6888dd24f..d586e4638 100644
--- a/code/nel/src/misc/common.cpp
+++ b/code/nel/src/misc/common.cpp
@@ -732,7 +732,22 @@ bool launchProgram(const std::string &programName, const std::string &arguments,
 		SetEnvironmentVariable( SE_TRANSLATOR_IN_MAIN_MODULE, NULL );
 	}
 
-	BOOL res = CreateProcessA(programName.empty() ? NULL:programName.c_str(), (char*)arguments.c_str(), NULL, NULL, FALSE, CREATE_DEFAULT_ERROR_MODE | CREATE_NO_WINDOW, NULL, NULL, &si, &pi);
+	const char *sProgramName = programName.c_str();
+
+	std::string args;
+
+	// a .bat file must have first parameter to NULL and use 2nd parameter to pass filename
+	if (CFile::getExtension(programName) == "bat")
+	{
+		sProgramName = NULL;
+		args = "\"" + programName + "\" " + arguments;
+	}
+	else
+	{
+		args = arguments;
+	}
+
+	BOOL res = CreateProcessA(sProgramName, (char*)args.c_str(), NULL, NULL, FALSE, CREATE_DEFAULT_ERROR_MODE | CREATE_NO_WINDOW, NULL, NULL, &si, &pi);
 
 	if (res)
 	{
diff --git a/code/ryzom/client/src/login_patch.cpp b/code/ryzom/client/src/login_patch.cpp
index 68b29b687..3273dc95d 100644
--- a/code/ryzom/client/src/login_patch.cpp
+++ b/code/ryzom/client/src/login_patch.cpp
@@ -719,7 +719,7 @@ void CPatchManager::stopPatchThread()
 // ****************************************************************************
 void CPatchManager::deleteBatchFile()
 {
-	deleteFile(UpdateBatchFilename, false, false);
+	deleteFile(ClientRootPath + UpdateBatchFilename, false, false);
 }
 
 // ****************************************************************************
@@ -938,21 +938,21 @@ void CPatchManager::executeBatchFile()
 	chmod(batchFilename.c_str(), S_IRWXU);
 #endif
 
-	std::string cmdLine = "\"" + batchFilename + "\" " + LoginLogin + " " + LoginPassword;
+	std::string arguments = LoginLogin + " " + LoginPassword;
 
 	if (!r2Mode)
 	{
-		cmdLine += " " + toString(LoginShardId);
+		arguments += " " + toString(LoginShardId);
 	}
 
-	if (launchProgram("", cmdLine, false))
+	if (launchProgram(batchFilename, arguments, false))
 	{
 		exit(0);
 	}
 	else
 	{
 		// error occurs during the launch
-		string str = toString("Can't execute '%s': code=%d %s (error code 30)", UpdateBatchFilename.c_str(), errno, strerror(errno));
+		string str = toString("Can't execute '%s': code=%d %s (error code 30)", batchFilename.c_str(), errno, strerror(errno));
 		throw Exception (str);
 	}
 }