Feat: Improve startup script for robust cross-environment execution

Author: stechdrive

insta360convert.bat

@@ -1,12 +1,50 @@
 @echo off
-REM Set console code page to UTF-8 to handle non-ASCII characters in paths or script output
+REM Set the console code page to UTF-8 to prevent issues with non-ASCII characters in paths or output.
 chcp 65001 > nul
 
-REM Change directory to the location of this batch file
-REM This ensures that the script can find any relative files correctly
+REM Change the current directory to the location of this batch file.
+REM This ensures that the script can correctly find any relative files (e.g., config files, other scripts).
 cd /d "%~dp0"
 
-REM Launch the Python GUI script without a console window
-REM "start" with an empty title "" runs the command in a new process and allows the batch file to exit immediately
-REM "pyw.exe" is used to run Python scripts without opening a console window, suitable for GUI applications
-start "" pyw insta360convert.py
+REM --- Auto-detect and execute Python environment ---
+
+REM Priority 1: Try the Python Launcher (py.exe).
+REM This is the standard way to run Python on Windows when installed from python.org,
+REM and it works even if Python is not in the system's PATH.
+where py >nul 2>nul
+if %errorlevel% == 0 (
+    echo Launching with Python Launcher (py.exe)...
+    py -w insta360convert.py
+    exit /b
+)
+
+REM Priority 2: Try python.exe.
+REM This covers installations from the Windows Store or official installers where python.exe was added to the PATH.
+REM The "start /b" command runs the script without creating a new console window.
+where python >nul 2>nul
+if %errorlevel% == 0 (
+    echo Launching with python.exe...
+    start /b python insta360convert.py
+    exit /b
+)
+
+REM Priority 3: Fallback to pyw.exe directly.
+REM This handles rare cases where only pyw.exe is in the PATH.
+REM The "start """ runs the command in a new process, allowing the batch file to exit immediately.
+where pyw >nul 2>nul
+if %errorlevel% == 0 (
+    echo Launching with pyw.exe...
+    start "" pyw insta360convert.py
+    exit /b
+)
+
+REM --- Error handling if no Python executable was found ---
+echo.
+echo =================================================================
+echo  Error: Could not find a Python installation.
+echo.
+echo  This program requires Python to run.
+echo  Please install it from the Microsoft Store or python.org.
+echo =================================================================
+echo.
+pause