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File selector dialog in Windows batch. Runs mshta (Microsoft HTML Application host) hidden to open a file dialog and get the path of the file selected.

@echo off
call :filedialog file
echo selected  file is : "%file%
exit /b

:filedialog :: &file
set dialog="about:<input type=file id=FILE><script>;new ActiveXObject
set dialog=%dialog%('Scripting.FileSystemObject').GetStandardStream(1).WriteLine(FILE.value);
set dialog=%dialog%close();resizeTo(0,0);</script>"
for /f "tokens=* delims=" %%p in ('mshta.exe %dialog%') do set "file=%%p"
endlocal  & set %1=%file%