diff --git a/companion.py b/companion.py
index 510510d5..60322231 100644
--- a/companion.py
+++ b/companion.py
@@ -15,6 +15,7 @@ import json
 import numbers
 import os
 import random
+import sys
 import threading
 import time
 import tkinter as tk
@@ -743,6 +744,10 @@ class Session(object):
             self.state = Session.STATE_INIT  # Will try to authorize again on next login or query
             self.auth = None
             raise  # Bad thing happened
+        if getattr(sys, 'frozen', False):
+            tk.messagebox.showinfo(title="Authentication Successful",
+                                   message="Authentication with cAPI Successful.\n"
+                                           "You may now close the Frontier login tab if it is still open.")
 
     def close(self) -> None:
         """Close the `request.Session()."""
diff --git a/config/__init__.py b/config/__init__.py
index e9079c28..9d647db5 100644
--- a/config/__init__.py
+++ b/config/__init__.py
@@ -52,7 +52,7 @@ appcmdname = 'EDMC'
 # <https://semver.org/#semantic-versioning-specification-semver>
 # Major.Minor.Patch(-prerelease)(+buildmetadata)
 # NB: Do *not* import this, use the functions appversion() and appversion_nobuild()
-_static_appversion = '5.9.2'
+_static_appversion = '5.9.4-alpha1'
 _cached_version: Optional[semantic_version.Version] = None
 copyright = '© 2015-2019 Jonathan Harris, 2020-2023 EDCD'
 
diff --git a/resources/EDMC_Installer_Config_template.txt b/resources/EDMC_Installer_Config_template.txt
index 7810270b..3abdc23a 100644
--- a/resources/EDMC_Installer_Config_template.txt
+++ b/resources/EDMC_Installer_Config_template.txt
@@ -32,7 +32,7 @@ LicenseFile=LICENSE
 AlwaysShowDirOnReadyPage=yes
 UninstallDisplayIcon={app}\{#MyAppExeName}
 MinVersion=6.2
-
+ChangesAssociations = yes
 
 [Languages]
 Name: "english"; MessagesFile: "compiler:Default.isl"
@@ -53,28 +53,42 @@ Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChang
 
 ;Check if a WiX-based installation exists. If so, kill it with fire.
 [Code]
+function IsWixInstalled: Boolean;
+var
+  Uninstall: String;
+begin
+  Result := RegQueryStringValue(HKLM, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{5E9AD4D3-0365-41D5-9586-9368745DD109}', 'UninstallString', Uninstall);
+end;
+
 procedure CurStepChanged(CurStep: TSetupStep);
 var
   ResultCode: Integer;
   Uninstall: String;
 begin
-  if (CurStep = ssInstall) then begin
-    if RegQueryStringValue(HKLM, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{5E9AD4D3-0365-41D5-9586-9368745DD109}', 'UninstallString', Uninstall) then begin
-      MsgBox('Warning: an old version of EDMC is installed! Please close EDMC while we remove the old version!', mbInformation, MB_OK);
-      Uninstall := '/x {5E9AD4D3-0365-41D5-9586-9368745DD109}';
-      Exec('MsiExec.exe', Uninstall, '', SW_SHOW, ewWaitUntilTerminated, ResultCode);
-    end;
+  if (CurStep = ssInstall) and IsWixInstalled then
+  begin
+    MsgBox('Warning: an old version of EDMC is installed! Please close EDMC while we remove the old version!', mbInformation, MB_OK);
+    Uninstall := '/x {5E9AD4D3-0365-41D5-9586-9368745DD109}';
+    Exec('MsiExec.exe', Uninstall, '', SW_SHOW, ewWaitUntilTerminated, ResultCode);
   end;
 end;
 
 
-[Registry]
-; Create the registry key for the custom file type
-Root: HKCR; Subkey: "edmc"; Flags: uninsdeletekey
-; Create the registry values for the custom file type
-Root: HKCR; Subkey: "edmc"; ValueType: string; ValueName: ""; ValueData: "{#MyAppName}"; Flags: uninsdeletevalue
-Root: HKCR; Subkey: "edmc\DefaultIcon"; ValueType: string; ValueName: ""; ValueData: "{app}\{#MyAppExeName},0"; Flags: uninsdeletevalue
-Root: HKCR; Subkey: "edmc\shell\open\command"; ValueType: string; ValueName: ""; ValueData: """{app}\{#MyAppExeName}"" ""%1"""; Flags: uninsdeletevalue
 
-; Register the URL protocol handler
+[Registry]
+; Create the main registry key under HKCR
+Root: HKCR; Subkey: "edmc"; Flags: uninsdeletevalue
+; Create a default value under the "edmc" key
+Root: HKCR; Subkey: "edmc"; ValueType: string; ValueName: ""; ValueData: "{#MyAppName}"; Flags: uninsdeletevalue
+; Create the "URL Protocol" value under the "edmc" key
 Root: HKCR; Subkey: "edmc"; ValueType: string; ValueName: "URL Protocol"; ValueData: ""; Flags: uninsdeletevalue
+; Create the "DefaultIcon" subkey under the "edmc" key
+Root: HKCR; Subkey: "edmc\DefaultIcon"; ValueType: string; ValueName: ""; ValueData: "{app}\EDMarketConnector.exe,0"; Flags: uninsdeletevalue
+; Create the "shell" subkey under the "edmc" key
+Root: HKCR; Subkey: "edmc\shell"; Flags: uninsdeletevalue
+; Create the "open" subkey under the "shell" subkey
+Root: HKCR; Subkey: "edmc\shell\open"; Flags: uninsdeletevalue
+; Create the "command" subkey under the "open" subkey
+Root: HKCR; Subkey: "edmc\shell\open\command"; ValueType: string; ValueName: ""; ValueData: """{app}\EDMarketConnector.exe"" ""%1"""; Flags: uninsdeletevalue
+; Create the "ddeexec" subkey under the "open" subkey
+Root: HKCR; Subkey: "edmc\shell\open\ddeexec"; ValueType: string; ValueName: ""; ValueData: "Open(""%1"")"; Flags: uninsdeletevalue