DllCall("GetModuleFileName","PTR",hDll,"PTR",&ModuleName,"UInt",MAX_PATH)

а потом эта переменная нигде не используется. Можно

	else
	{
		hProc := DllCall("OpenProcess","UInt", PROCESS_ALL_ACCESS, "Int",0,"UInt", DllCall("GetCurrentProcessId"),"PTR")
		DllCall("GetModuleFileName","PTR",hDll,"PTR",&ModuleName,"UInt",MAX_PATH)
		DllCall("CloseHandle","PTR",hProc)
	}
	dll := StrGet(&ModuleName)

InjectAhkDll(PID,dll:="AutoHotkey64.dll",script:=0, deleteThread := false)
{
   static PROCESS_ALL_ACCESS:=0x1F0FFF,MEM_COMMIT := 0x1000,MEM_RELEASE:=0x8000,PAGE_EXECUTE_READWRITE:=64
   ,hKernel32:=DllCall("LoadLibrary","Str","kernel32.dll","PTR"),LoadLibraryA:=DllCall("GetProcAddress","PTR",hKernel32,"AStr","LoadLibraryA","PTR")
   ,FreeLibrary:=DllCall("GetProcAddress","PTR",hKernel32,"AStr","FreeLibrary","PTR")
   ,TH32CS_SNAPMODULE:=0x00000008,INVALID_HANDLE_VALUE:=-1
   ,MAX_PATH:=260,MAX_MODULE_NAME32:=255,ModuleName:="",init:=VarSetCapacity(ModuleName,MAX_PATH*(A_IsUnicode?2:1))
   base:= deleteThread ? {__Call:"InjectAhkDll",__Delete:"InjectAhkDll"} : {__Call:"InjectAhkDll"}

   if IsObject(PID)
   {
      if (dll!="Exec" && script)
         return "Only Exec method can be used here!"

      hProc := DllCall("OpenProcess", "UInt", PROCESS_ALL_ACCESS, "Int",0, "UInt", PID.PID,"PTR")
      if !hProc
         return "Could not open process for PID: " PID.PID

      if (!script) ; Free Library in remote process (object is being deleted)
      {
         ; Terminate the thread in ahkdll
         hThread := DllCall("CreateRemoteThread", "PTR", hProc, "PTR", 0, "PTR", 0, "PTR", PID.ahkTerminate, "PTR", 0, "UInt", 0, "PTR", 0,"PTR")
         DllCall("WaitForSingleObject", "PTR", hThread, "UInt", 0xFFFFFFFF)
         ,DllCall("CloseHandle", "PTR", hThread)

         ; Free library in remote process
         hThread := DllCall("CreateRemoteThread", "PTR", hProc, "UInt", 0, "UInt", 0, "PTR", FreeLibrary, "PTR", PID.hModule, "UInt", 0, "UInt", 0,"PTR")
         DllCall("WaitForSingleObject", "PTR", hThread, "UInt", 0xFFFFFFFF)
         ,DllCall("CloseHandle", "PTR", hThread),DllCall("CloseHandle", "PTR", hProc)
         return
      }

      nScriptLength := VarSetCapacity(nScript, (StrLen(script)+1)*(A_IsUnicode?2:1), 0)
      ,StrPut(script,&nScript)

      ; Reserve memory in remote process where our script will be saved
      if !pBufferRemote := DllCall("VirtualAllocEx", "Ptr", hProc, "Ptr", 0, "PTR", nScriptLength, "UInt", MEM_COMMIT, "UInt", PAGE_EXECUTE_READWRITE, "Ptr")
         return "Could not reseve memory for process"
      ,DllCall("CloseHandle", "PTR", hProc)

      ; Write script to remote process memory
      DllCall("WriteProcessMemory", "Ptr", hProc, "Ptr", pBufferRemote, "Ptr", &nScript, "PTR", nScriptLength, "Ptr", 0)

      ; Start execution of code
      hThread := DllCall("CreateRemoteThread", "PTR", hProc, "PTR", 0, "PTR", 0, "PTR", PID.ahkExec, "PTR", pBufferRemote, "UInt", 0, "PTR", 0,"PTR")
      if !hThread
      {
         DllCall("VirtualFreeEx","PTR",hProc,"PTR",pBufferRemote,"PTR",nScriptLength,MEM_RELEASE)
         ,DllCall("CloseHandle", "PTR", hProc)
         return "Could not execute script in remote process"
      }

      ; Wait for thread to finish
      DllCall("WaitForSingleObject", "PTR", hThread, "UInt", 0xFFFFFFFF)

      ; Get Exit code returned by ahkExec (1 = script could be executed / 0 = script could not be executed)
      DllCall("GetExitCodeThread", "PTR", hThread, "UIntP", lpExitCode)
      if !lpExitCode
         return "Could not execute script in remote process"

      DllCall("CloseHandle", "PTR", hThread)
      ,DllCall("VirtualFreeEx","PTR",hProc,"PTR",pBufferRemote,"PTR",nScriptLength,MEM_RELEASE)
      ,DllCall("CloseHandle", "PTR", hProc)
      return
   }
   else if !hDll:=DllCall("LoadLibrary","Str",dll,"PTR")
      return "Could not find " dll " library", DllCall("CloseHandle", "PTR", hProc)
   else
   {
      hProc := DllCall("OpenProcess","UInt", PROCESS_ALL_ACCESS, "Int",0,"UInt", DllCall("GetCurrentProcessId"),"PTR")
      DllCall("GetModuleFileName","PTR",hDll,"PTR",&ModuleName,"UInt",MAX_PATH)
      DllCall("CloseHandle","PTR",hProc)
   }
   ; Open Process to PID
   hProc := DllCall("OpenProcess", "UInt", PROCESS_ALL_ACCESS, "Int",0, "UInt", PID,"PTR")
   if !hProc
      return "Could not open process for PID: " PID
   
   Loop, Files, %dll%, F
      dll := A_LoopFileLongPath
   ; Reserve some memory and write dll path (ANSI)
   nDirLength := VarSetCapacity(nDir, StrLen(dll)+1, 0)
   ,StrPut(dll,&nDir,"CP0")

   ; Reserve memory in remote process
   if !pBufferRemote := DllCall("VirtualAllocEx", "Ptr", hProc, "Ptr", 0, "PTR", nDirLength, "UInt", MEM_COMMIT, "UInt", PAGE_EXECUTE_READWRITE, "Ptr")
      return "Could not reseve memory for process", DllCall("CloseHandle", "PTR", hProc)

   ; Write dll path to remote process memory
   DllCall("WriteProcessMemory", "Ptr", hProc, "Ptr", pBufferRemote, "Ptr", &nDir, "PTR", nDirLength, "Ptr", 0)

   ; Start new thread loading our dll

   hThread:=DllCall("CreateRemoteThread","PTR",hProc,"PTR",0,"PTR",0,"PTR",LoadLibraryA,"PTR",pBufferRemote,"UInt",0,"PTR",0,"PTR")
   if !hThread
   {
      DllCall("VirtualFreeEx","PTR",hProc,"PTR",pBufferRemote,"PTR",nDirLength,"Uint",MEM_RELEASE)
      ,DllCall("CloseHandle", "PTR", hProc)
      return "Could not load " dll " in remote process"
   }
   ; Wait for thread to finish
   DllCall("WaitForSingleObject", "PTR", hThread, "UInt", 0xFFFFFFFF)

   ; Get Exit code returned by thread (HMODULE for our dll)
   DllCall("GetExitCodeThread", "PTR", hThread, "UInt*", hModule)

   ; Close Thread
   DllCall("CloseHandle", "PTR", hThread)

   if (A_PtrSize=8)
   { ; use different method to retrieve base address because GetExitCodeThread returns DWORD only
      hModule:=0,VarSetCapacity(me32, (A_PtrSize=8?48:32)+(A_IsUnicode?1032:516), 0) ;W:1080:1064, A:564:548
      ;  Take a snapshot of all modules in the specified process.
      hModuleSnap := DllCall("CreateToolhelp32Snapshot","UInt", TH32CS_SNAPMODULE,"UInt", PID, "PTR" )
      if ( hModuleSnap != INVALID_HANDLE_VALUE )
      {
         ; reset hModule and set the size of the structure before using it.
         NumPut((A_PtrSize=8?48:32)+(A_IsUnicode?1032:516), &me32, 0, "UInt") ;dwSize  ;W:1080:1064, A:564:548
         ;  Retrieve information about the first module,
         ;  and exit if unsuccessful
         if ( !DllCall("Module32First" (A_IsUnicode?"W":""),"PTR", hModuleSnap,"PTR", &me32 ) )
         {
            ; Free memory used for passing dll path to remote thread
            DllCall("VirtualFreeEx","PTR",hProc,"PTR",pBufferRemote,"PTR",nDirLength,MEM_RELEASE)
            ,DllCall("CloseHandle","PTR", hModuleSnap ) ; Must clean up the snapshot object!
            return false
         }
         ;  Now walk the module list of the process,and display information about each module
         while(A_Index=1 || DllCall("Module32Next" (A_IsUnicode?"W":""),"PTR",hModuleSnap,"PTR", &me32 ) )
            if (StrGet(&me32+(A_PtrSize=8?48:32)+(A_IsUnicode?512:256))=dll) ;szExePath ;W:560:544, A:304:288
            {
               hModule := NumGet(me32, A_PtrSize=8?40:28, "Ptr") ;hModule
               break
            }
         DllCall("CloseHandle","PTR",hModuleSnap) ; clean up
      }
   }

   hDll:=DllCall("LoadLibrary","Str",dll,"PTR")

   ; Calculate pointer to ahkdll and ahkExec functions
   ahktextdll:=hModule+DllCall("GetProcAddress","PTR",hDll,"AStr","ahktextdll","PTR")-hDll
   ahkExec:=hModule+DllCall("GetProcAddress","PTR",hDll,"AStr","ahkExec","PTR")-hDll
   ahkTerminate:=hModule+DllCall("GetProcAddress","PTR",hDll,"AStr","ahkTerminate","PTR")-hDll

   if script
   {
      nScriptLength := VarSetCapacity(nScript, (StrLen(script)+1)*(A_IsUnicode?2:1), 0)
      ,StrPut(script,&nScript)
      ; Reserve memory in remote process where our script will be saved
      if !pBufferScript := DllCall("VirtualAllocEx", "Ptr", hProc, "Ptr", 0, "PTR", nScriptLength, "UInt", MEM_COMMIT, "UInt", PAGE_EXECUTE_READWRITE, "Ptr")
         return "Could not reseve memory for process"
      ,DllCall("CloseHandle", "PTR", hProc)

      ; Write script to remote process memory
      DllCall("WriteProcessMemory", "Ptr", hProc, "Ptr", pBufferScript, "Ptr", &nScript, "PTR", nScriptLength, "Ptr", 0)
   }
   else
      pBufferScript:=0

   ; Run ahkdll function in remote thread
   hThread := DllCall("CreateRemoteThread","PTR",hProc,"PTR",0,"PTR",0,"PTR",ahktextdll,"PTR",pBufferScript,"PTR",0,"UInt",0,"PTR")
   if !hThread
   { ; could not start ahkdll in remote process
      ; Free memory used for passing dll path to remote thread
      DllCall("VirtualFreeEx","PTR",hProc,"PTR",pBufferRemote,"PTR",nDirLength,MEM_RELEASE)
      DllCall("CloseHandle", "PTR", hProc)
      return "Could not start ahkdll in remote process"
   }
   DllCall("WaitForSingleObject", "PTR", hThread, "UInt", 0xFFFFFFFF)
   DllCall("GetExitCodeThread", "PTR", hThread, "UIntP", lpExitCode)

   ; Release memory and handles
   DllCall("VirtualFreeEx","PTR",hProc,"PTR",pBufferRemote,"PTR",nDirLength,MEM_RELEASE)
   DllCall("CloseHandle", "PTR", hThread)
   DllCall("CloseHandle", "PTR", hProc)

   if !lpExitCode ; thread could not be created.
      return "Could not create a thread in remote process"

   return {PID:PID,hModule:hModule,ahkExec:ahkExec,ahkTerminate:ahkTerminate,base:base}
}

Ликбез пока не могу, работы завал.

if (StrGet(&me32+(A_PtrSize=8?48:32)+(A_IsUnicode?512:256))=dll)

StrGet возвращает полные пути.