Here's a version that persits the current user's PATH (i.e., not
system-wide):
rem SOF
@echo off
set "OWNPATH=%~dp0"
set "PLATFORM=mswin"
if defined ProgramFiles(x86) set "PLATFORM=win64"
if "%PROCESSOR_ARCHITECTURE%"=="AMD64" set "PLATFORM=win64"
if exist "%OWNPATH%tex\texmf-mswin\bin\context.exe" set "PLATFORM=mswin"
if exist "%OWNPATH%tex\texmf-win64\bin\context.exe" set "PLATFORM=win64"
set "TeXPath=%OWNPATH%tex\texmf-%PLATFORM%\bin"
echo %PATH% | findstr "texmf-%PLATFORM%" > nul
rem Only update the PATH if not previously updated
if ERRORLEVEL 1 (
setlocal enabledelayedexpansion
set "Exists=false"
set "Key=HKCU\Environment"
for /F "USEBACKQ tokens=2*" %%A in (`reg query %%Key%% /v PATH 2^>nul`)
do (
if not "%%~B" == "" (
set "Exists=true"
rem Preserve the existing PATH
echo %%B > currpath.txt
rem Change the PATH environment variable
setx PATH "%%B;%TeXPath%"
)
)
rem The user-defined PATH does not exist, create it
if "!Exists!" == "false" (
rem Change the user PATH environment variable
setx PATH "%TeXPath%"
)
endlocal
rem Update the current session
set "PATH=%PATH%;%TeXPath%"
)
rem EOF
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