Windows: Move all Matlab mexw64 mex files into PsychBasic folder.

The special PsychBasic/MatlabWindowsFilesR2007a subfolder is
obsolete since a long time, so get rid of it and store the Matlab
mex files for Windows in the same location as the Matlab mex files
for Linux and macOS - the PsychBasic/ folder. The file extension
makes sure everything gets sorted. This may make it possible to
reenable "Matlab Toolbox Add-On" MLTBX support in the future.

Adapt AssertMex() and PsychtoolboxPostInstallRoutine() accordingly.

Untested so far.

Psychtoolbox/PsychOneliners/AssertMex.m

@@ -156,36 +156,15 @@
     fprintf(['  ' mexFilename '\n\n']);
 
     if isempty(which(mexFilename))
-        if strcmp(computer, 'MAC')
-            % Mac PowerPC:
-            fprintf('Matlab running on MacOSX on a PowerPC based Apple Macintosh computer is no longer supported.\n');
-            fprintf('You would need to get a version 3.0.9 or earlier Psychtoolbox for this to work on your computer.\n');
-            fprintf('Or upgrade your computer to run a modern version of GNU/Linux and use the Psychtoolbox for Linux on PowerPC.\n\n');
-        elseif (IsWin && exist('mexext') && strcmp(mexext, 'dll')) %#ok<EXIST>
-            % Windows with Matlab pre-R2007a:
-            fprintf('Matlab versions older than V7.4 aka R2007a running on MS-Windows are no longer supported by this release.\n');
-            fprintf('Install GNU/Octave or a more modern Matlab version instead. Or downgrade to Psychtoolbox version 3.0.9 or earlier.\n\n');
-        else
-            fprintf('Hmm. I cannot find the file on your Matlab path?!?\n\n');
-            fprintf('One reason could be that your Matlab path is wrong or not up to date\n');
-            fprintf('for the current Psychtoolbox. You may want to run SetupPsychtoolbox to \n');
-            fprintf('fix possible path problems.\n\n');
-        end
+        fprintf('Hmm. I cannot find the file on your Matlab path?!?\n\n');
+        fprintf('One reason could be that your Matlab path is wrong or not up to date\n');
+        fprintf('for the current Psychtoolbox. You may want to run SetupPsychtoolbox to \n');
+        fprintf('fix possible path problems.\n\n');
     else
-        if IsWin
-            fprintf('It is important that the folder which contains the Screen mex file is located *before*\n');
-            fprintf('the PsychBasic folder on your Matlab path.\n');
-            fprintf('On Matlab V7.4 (R2007a) or later versions, the folder\n');
-            fprintf('%sPsychBasic\\MatlabWindowsFilesR2007a\\ must be before the folder\n%sPsychBasic\\ \n\n', PsychtoolboxRoot, PsychtoolboxRoot);
-            fprintf('type path to display the current path and check for this condition.\nIf the order is wrong, ');
-            fprintf('simply cd into your Psychtoolbox root folder\n%s and then run SetupPsychtoolbox again.\n', PsychtoolboxRoot);
-            fprintf('That is the simplest way of fixing such path problems - Or to get more diagnostic output.\n\n');
-        end
-
         if ~isequal(which(mexFilename), which(callerName))
             fprintf('Seems %s.m is in the Matlab path before/above %s instead of after/below it!\n', callerName, mexFilename);
             fprintf('This will cause the mex file to be ignored, leading to this error.\n');
-            fprintf('Please run SetupPsychtoolbox again, to rectify this problem, or use Matlabs pathtool\n');
+            fprintf('Please run SetupPsychtoolbox again to rectify this problem, or use Matlabs pathtool\n');
             fprintf('to shuffle things into the right order. This folder:\n\n');
             fprintf('%s\n', fileparts(which(mexFilename)));
             fprintf('\nneeds to go above/before this folder:\n\n');
@@ -196,12 +175,12 @@
         end
 
         if IsWin
-            fprintf('On Microsoft Windows with supported Matlab versions (>= V7.4) it could also be that\n');
-            fprintf('the required Visual C++ 2015-2019 runtime libraries are missing on your system.\n');
+            fprintf('On Microsoft Windows with supported Matlab versions R2014b or later, it could also mean\n');
+            fprintf('that the required Visual C++ 2015-2019 runtime libraries are missing on your system.\n');
             fprintf('The Psychtoolbox/PsychContributed/ subfolder contains installer files for them, which\n');
             fprintf('you can execute after quitting Matlab. The name of the file is:\n');
             if IsWin(1)
-                fprintf('vcredist_x64_2015-2019.exe and maybe also vcredist_x64_2010.exe.\n');
+                fprintf('vcredist_x64_2015-2019.exe - you maybe also additionally need vcredist_x64_2010.exe.\n');
             else
                 fprintf('unknown - no longer ships with this version of Psychtoolbox.\n');
             end

Psychtoolbox/PsychtoolboxPostInstallRoutine.m

@@ -85,6 +85,8 @@ function PsychtoolboxPostInstallRoutine(isUpdate, flavor)
 % 11/24/2024 Call the 1st time setup routine PsychLicenseHandling() as
 %            needed to enable license management on Apple macOS and
 %            Microsoft Windows. (MK)
+% 01/31/2025 Remove subfolder MatlabWindowsFilesR2007a for Matlab on Windows, and associated
+%            special path setup on Matlab for Windows. (MK)
 
 fprintf('\n\nRunning post-install routine...\n\n');
 
@@ -551,49 +553,20 @@ function PsychtoolboxPostInstallRoutine(isUpdate, flavor)
 
 % Special case handling for different Matlab releases on MS-Windoze:
 if IsWin && ~IsOctave
-    rc = 0;
-
     if strfind(cd, 'system32') %#ok<STRIFCND>
         % the below code fails if the current directory is system32 (e.g.
         % C:\Windows\system32), as it contains dlls like version.dll, which
         % get called instead of the built-in functions....
         cd(PsychtoolboxRoot);
     end
 
-    try
-        % Remove DLL folders from path:
-        rmpath([PsychtoolboxRoot 'PsychBasic\MatlabWindowsFilesR2007a\']);
-
-        % Is this a Release2014b (Version 8.4.0) or later Matlab?
-        if verLessThan('matlab', '8.4.0')
-            % This is a pre-R2014b Matlab: No longer supported by V 3.0.18+
-            fprintf('Matlab release prior to R2014b detected. This version is no longer\n');
-            fprintf('supported by Psychtoolbox 3.0.18 and later. Aborted.');
-            fprintf('\n\nInstallation aborted. Fix the reported problem and retry.\n\n');
-            return;
-        else
-            % This is a R2014b or later Matlab:
-            % Add PsychBasic/MatlabWindowsFilesR2007a/ subfolder to Matlab path:
-            rdir = [PsychtoolboxRoot 'PsychBasic\MatlabWindowsFilesR2007a\'];
-            fprintf('Matlab release 2014b or later detected. Will prepend the following\n');
-            fprintf('folder to your Matlab path: %s ...\n', rdir);
-            addpath(rdir);
-        end
-
-        rc = savepath;
-    catch
-        rc = 2;
-    end
-
-    if rc > 0
-        fprintf('=====================================================================\n');
-        fprintf('ERROR: Failed to prepend folder %s to Matlab path!\n', rdir);
-        fprintf('ERROR: This will likely cause complete failure of PTB to work.\n');
-        fprintf('ERROR: Please fix the problem (maybe insufficient permissions?)\n');
-        fprintf('ERROR: If everything else fails, add this folder manually to the\n');
-        fprintf('ERROR: top of your Matlab path.\n');
-        fprintf('ERROR: Trying to continue but will likely fail soon.\n');
-        fprintf('=====================================================================\n\n');
+    % Is this a R2014b (Version 8.4.0) or later Matlab?
+    if verLessThan('matlab', '8.4.0')
+        % This is a pre-R2014b Matlab: No longer supported by V 3.0.18+
+        fprintf('Matlab release prior to R2014b detected. This version is no longer\n');
+        fprintf('supported by Psychtoolbox 3.0.18 and later. Aborted.');
+        fprintf('\n\nInstallation aborted. Fix the reported problem and retry.\n\n');
+        return;
     end
 
     try