C++ How to get MailSlot Handle via MailSlotName - c++

Question

We are using window's mailslots in one of our Windows 10 application.
Usually windows is very good at managing them, but we recently came across an issue where the MailSlot does not close anymore, meaning every time our application is started it leads to a crash.
Usually we would diagnose the issue to know exactly where it comes from, but in this case it would require paralysing the production line for several days, which we can't afford.
So we decided to create a script/application to close the mailslot if it exists when we start the program, since the program is currently being launched through a batch file.
I have tried this :
HANDLE OpenProcessByName(LPCTSTR Name, DWORD dwAccess)
{
HANDLE hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (hSnap != INVALID_HANDLE_VALUE)
{
PROCESSENTRY32 pe;
ZeroMemory(&pe, sizeof(PROCESSENTRY32));
pe.dwSize = sizeof(PROCESSENTRY32);
Process32First(hSnap, &pe);
do
{
if (!lstrcmpi(pe.szExeFile, Name))
{
return OpenProcess(dwAccess, 0, pe.th32ProcessID);
}
} while (Process32Next(hSnap, &pe));
}
return INVALID_HANDLE_VALUE;
}
As you can expect, this return process names not mailslot names
Is there any way to modify the code snippet above to work with mailslot names (for the sake of examples we can assume that the mailslot is located here : \Device\Mailslot\sample_mailslot with sample_mailslot being its name)
Or is there a different way to go about things ?
PS :
I know that the best way would be to store the HANDLE that's being returned when we create the mailslot, the issue is we don't have access to the source code, so we are forced to work outside it.