diff --git a/PySimpleGUI.py b/PySimpleGUI.py
index 783d381e..f2070fa2 100644
--- a/PySimpleGUI.py
+++ b/PySimpleGUI.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 
-version = __version__ = "4.45.0.12  Unreleased\nAdded autoscroll parameter to Multiline.print & cprint - defaults to True (backward compatible), ButtonMenu use font for button as menu font if none is supplied, make a copy of menu definition when making ButtonMenu, made menu definition optional for ButtonMenu so can change only some other settings, set class_ for Toplevel windows to fix problem with titles on some Linux systems, fix bug when menu shortcut char in first pos and item is disabled !&Item, Sizegrip - fixed expansion problem. Should not have expanded row, added kill application button to error popup. cprint & Multiline.print will now take a single color and use as text color, keep_on_top added to one_line_progress_meter. Deprication warning added to FindElement as first step of moving out of non-PEP8 world, added TabGroup.add_tab, allow modal window on the Mac again as an experiment. set cwd='.' if dir not found in execute_py_file"
+version = __version__ = "4.45.0.13  Unreleased\nAdded autoscroll parameter to Multiline.print & cprint - defaults to True (backward compatible), ButtonMenu use font for button as menu font if none is supplied, make a copy of menu definition when making ButtonMenu, made menu definition optional for ButtonMenu so can change only some other settings, set class_ for Toplevel windows to fix problem with titles on some Linux systems, fix bug when menu shortcut char in first pos and item is disabled !&Item, Sizegrip - fixed expansion problem. Should not have expanded row, added kill application button to error popup. cprint & Multiline.print will now take a single color and use as text color, keep_on_top added to one_line_progress_meter. Deprication warning added to FindElement as first step of moving out of non-PEP8 world, added TabGroup.add_tab, allow modal window on the Mac again as an experiment. set cwd='.' if dir not found in execute_py_file, check for exists in execute_py_file"
 
 __version__ = version.split()[0]    # For PEP 396 and PEP 345
 
@@ -18743,9 +18743,10 @@ def execute_py_file(pyfile, parms=None, cwd=None, interpreter_command=None, wait
     :rtype: (subprocess.Popen) | None
     """
     if cwd is None:
-        cwd = os.path.dirname(pyfile)
-        if cwd == '':
+        # if the specific file is not found (not an absolute path) then assume it's relative to '.'
+        if not os.path.exists(pyfile):
             cwd = '.'
+
     if pyfile[0] != '"' and ' ' in pyfile:
         pyfile = '"'+pyfile+'"'
     if interpreter_command is not None: