Windows EXE: Start Powershell instead of cmd

... if started by file explorer.

deploy/windows/create_exe.py

@@ -17,7 +17,7 @@ import subprocess
 def __main():
     with contextlib.suppress(AttributeError, psutil.Error):
         if psutil.Process().parent().parent().name() == "explorer.exe":
-            subprocess.Popen("cmd /K \\\"{0}\\\"".format(os.path.splitext(os.path.basename(sys.argv[0]))[0]))
+            subprocess.Popen("powershell -NoExit -Command \\\"& {0}\\\"".format(sys.argv[0]))
             return
     main()
 

instaloader/__main__.py

@@ -3,6 +3,7 @@
 import ast
 import datetime
 import os
+import platform
 import re
 import sys
 from argparse import ArgumentParser, SUPPRESS
@@ -15,10 +16,20 @@ from .instaloader import get_default_session_filename
 from .instaloadercontext import default_user_agent
 
 
+def get_simple_argv0() -> str:
+    if platform.system() != "Windows":
+        argv0 = os.path.basename(sys.argv[0])
+    else:
+        dirname = os.path.relpath(os.path.dirname(sys.argv[0]))
+        basename = os.path.basename(sys.argv[0])
+        argv0 = os.path.join(dirname, basename)
+    argv0 = "instaloader" if argv0 == "__main__.py" else argv0
+    return argv0
+
+
 def usage_string():
     # NOTE: duplicated in README.rst and docs/index.rst
-    argv0 = os.path.basename(sys.argv[0])
+    argv0 = get_simple_argv0()
-    argv0 = "instaloader" if argv0 == "__main__.py" else argv0
     return """
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