[[escafandra]]

Cambia tambien esto

bool TerminateProcess(char* FileName)

bool TerminateProcessW(WCHAR* FileName)

Te pongo la versión completa Unicode:

#include <tlhelp32.h>

// Termina los procesos conociendo el nombre del exe
bool TerminateProcessW(WCHAR* FileName)
{
   DWORD  Result  = 0;
   HANDLE Process = 0;
   PROCESSENTRY32W proc = { sizeof(proc) };
   HANDLE hSysSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
   if(hSysSnapshot != INVALID_HANDLE_VALUE && Process32FirstW(hSysSnapshot, &proc)){
     do{
        if(!_wcsicmp(proc.szExeFile, FileName)){
           Result = proc.th32ProcessID;
           if(Result)
              Process = OpenProcess(PROCESS_ALL_ACCESS, false, Result);
              if(Process){
                 Result = TerminateProcess(Process, 0);
                 CloseHandle(Process);
              }  
        }
     }while(Process32NextW(hSysSnapshot, &proc));
   }
   CloseHandle(hSysSnapshot);
   return (bool)Result;
}

Saludos.