Qt Installer Framework detached process problem

[MarKS]

I am trying to build an installer using Qt Framework Installer 4.2 where I need to remove some folders from C:/Program Files and C:/ProgramData. Referring to this I realized I need to pass arguments to detached process as a string list. Here is how my install script looks like:

function Component()
{
}

Component.prototype.createOperations = function()
{
    try {
        // call the base create operations function
        component.createOperations();
    } catch (e) {
        console.log(e);
    }
	
    if (systemInfo.productType === "windows") 
    {
	component.addOperation("CreateShortcut", "@TargetDir@/App.exe", "@StartMenuDir@/Desktop Application.lnk",
        "workingDirectory=@TargetDir@");

        component.addOperation("CreateShortcut", "@TargetDir@/App.exe", "@HomeDir@/Desktop/Desktop Application.lnk");
		
		if(installer.fileExists(somePathFile))
		{
		  installer.executeDetached("cmd", ["del", "C:/ProgramData/DesktopApp/Config/settings.json"], "@TargetDir@");
		  installer.executeDetached("cmd", ["/s", "rmdir", "C:/ProgramData/DesktopApp/Config"], "@TargetDir@");
		}
		
		if(installer.fileExists(somePathFile))
		{
		  installer.executeDetached("cmd", ["del", "C:/ProgramData/DesktopApp/Logs/app_log.txt"], "@TargetDir@");
		  installer.executeDetached("cmd", ["del", "C:/ProgramData/DesktopApp/Logs/app_log.old.txt"], "@TargetDir@");
		  installer.executeDetached("cmd", ["/s", "rmdir", "C:/ProgramData/DesktopApp/Logs"], "@TargetDir@");
		}
		
         	installer.executeDetached("cmd", ["del", "@TargetDir@/Config/settings.json"], "@TargetDir@");
		installer.executeDetached("cmd", ["/s", "rmdir", "@TargetDir@/Config"], "@TargetDir@");
			
		installer.executeDetached("cmd", ["del", "@TargetDir@/Logs/app_log.txt"], "@TargetDir@");
		installer.executeDetached("cmd", ["del", "@TargetDir@/Logs/app_log.old.txt"], "@TargetDir@");
		installer.executeDetached("cmd", ["/s", "rmdir", "@TargetDir@/Logs"], "@TargetDir@");	
    }
}

Running the installer successfully installs the program but none of the above commands perform. InstallationLog.txt looks like this:

run application as detached process: "cmd" ("del", "C:/ProgramData/DesktopApp/Config/settings.json") "C:/Program Files/DesktopApp"

Same output for the rest of the commands. It just doesn't delete anything.

using component.addOperation("Execute", "...") method freezes the whole installation. So, I thought I would rather stick to installer object.