use total commander script content plugin with autohotkey scriptsplace files in directory of installed script.wdx, add columns with "[=script.Result]" which will show line number of files - counted by ahk script #totalcmd #ahk

ahk-plugin-totalcmd.ahk

; requires WinScript Advanced Content Plugin for Total Commander: http://totalcmd.net/plugring/WinScriptAdv.html

#NoEnv
#NoTrayIcon
FileEncoding UTF-8

SetBatchLines,-1 
file = %filename%

; find file
if FileExist(file)
{
  ; check size
  FileGetSize, fileSize, %file%
  if (fileSize < 1000000)
  {
    returnValue := countLines(file)  
  }
  else
  {
    returnValue := "---"
  }
}     
else if StrLen(file) = 0
{
  ; missing argument
  returnValue := -1
}
else
{
  ; file not found
  returnValue := -1
}

;Msgbox, (%returnValue%) %file%


if (returnValue = "" or returnValue = -1) {
  content = 0
} else {
  content = %returnValue%
}



;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;  file functions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; return number of lines
countLines(file)
{ 
Loop, read, %file%
  lineCount := A_Index  
  return lineCount
}

script.ini

[Lines]

Script=lines.ahk
content=Number of lines
extensions=*
FoldersPaths=0