Hi Dimitar,

Please, to refer Ticket ID: 1565786 and i 've added a sample file.

To resolve this, I used ghostscript/gswin64c

I add ghoscript portable application in my project and transform the file before viewing it.

My problem, I need a way to dectect the trouble before transform the file.

From the web

@echo off
setlocal EnableDelayedExpansion

rem ghostscript executable name
set "ghostscript=gswin64"

rem directories to scan for files
set "filesDir[0]=D:\Partages\SMPLA\Gravette\Documents\LPM\LPM"
rem set "filesDir[1]=FOLDER2"
rem set "filesDir[2]=FOLDER3"

rem extension of files to be scanned
set "ext=pdf"

rem new file be creation or input file overwrite
set "createNewPDFs=0"
rem file prefix for new files (if they should be created)
set "filepre=compr_"

rem loop over all directories defined in filesDir array
for /f "tokens=2 delims==" %%d in ('set filesDir[') do (
   if exist "%%~d" (
      pushd "%%~d"
      rem loop over all files in all (sub)directories with given extension
      for /f "delims=*" %%f in ('dir "*.%ext%" /b /s /a:-d') do (
         if [%createNewPDFs%] EQU [1] (
            %ghostscript% -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -dNOPAUSE -dQUIET -dBATCH -sOutputFile="%%~dpf%filepre%%%~nxf" "%%~f"
         ) else (
            %ghostscript% -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -dNOPAUSE -dQUIET -dBATCH -sOutputFile="%TEMP%\%%~nxf" "%%~f"
        
    copy "%%~f" "%%~f.old"
    move /y "%TEMP%\%%~nxf" "%%~f"
         )

      )
      popd
   )
)