Uncle Captain

@roytam1 I tested the GetSystemTimes change in the kernelxp wrapper, and then it worked.

Firefox 45.9.34 and K-Meleon 76.5.5 worked on Windows XP RTM with kernelxp.dll wrappers unofficially. The thing is for K-Meleon 76.5.5 on XP RTM, you'll get a BSOD. To fix this, remove the manifests on the main K-Meleon executable, and then it works. I also tested New Moon 27 on Windows XP RTM with kernelxp.dll wrappers unofficially, and then it worked too. Note: Firefox-based browsers are compiled with Visual C++ 2013 runtimes are the last to run unofficially on Windows XP RTM (with kernelxp.dll wrappers) correctly. Firefox-based browsers are compiled with Visual C++ 2015-2019 runtimes would unofficially require at least Windows XP SP1 (with kernelxp.dll wrappers) for any stability.

@roytam1 1) What about making an unofficial api-ms-win-core-util-l-1-1-0.dll wrapper (for VC2015,17,19 apps) for XP SP1 by replacing the kernel32 references with kernelxp references in the hex editor? 2) What about adding GetSystemTimes function to your mini kernelxp.dll wrapper, because I noticed it was missing for some applications.

I even managed going down to XP build 2474 for Firefox 48.0.2 / Firefox 45.9.x ESR to work. I managed getting Firefox 48.0.2 to work on Windows XP build 2474 at the minimum unofficially, see the text file: And functions like GetModuleHandleExA, GetModuleHandleExW, and IsWow64Process was introduced in build 2474, I tried to replace the stubs (GetModuleHandleExA --> GetModuleHandleA), (GetModuleHandleExW --> GetModuleHandleW), and (IsWow64Process --> GetStdHandle), and Firefox 48.0.2 launches a process (firefox.exe), but not initalized properly on Windows XP build 2469. Is there matching stubs for GetModuleHandleExA, GetModuleHandleExW, and IsWow64Process to try to get Firefox 48.0.2 to work on Windows XP build 2469, is it the system itself, or is 2474 the dead end for Firefox 48.0.2/45.9.x to work? The number of parameters (1, not 2) might not match and it might not return FALSE as needed for that 2469 thing. Firefox48on2474.txt

I finally managed to get Firefox 48.0.2 to work on Windows XP RTM! Notes kernelxp.dll stays in the "firefox" directories after patching, or else it will NOT work. The unofficial guide "How to get Firefox 48.0.2 / 45.9.x ESR to work on Windows XP RTM!" is now available. This guide is made by me. https://sites.google.com/view/clara-incorporated/modernization/windows-xp-rtm/firefox-48-0-2-firefox-45-9-x-esr

The unofficial guide "How to get MyPal 68 working on Windows XP SP1!" is now available. This guide is made by me. This would be useful for Althon XP/Pentium III machines running Windows XP SP1, because Supermium does NOT support processors without SSE2 yet. https://sites.google.com/view/clara-incorporated/modernization/windows-xp-sp1/firefox-based-browsers/mypal-68 @feodor2and @roytam1

Okay. Your suggestion just worked for me as well as FindNextFileA works too when I got mypal68 to work on Windows XP SP1.

I did get Mypal 68 to work on XP RTM by installing the KB921337 update (to tweak as SP2 with CSDVersion set to 200), it is startable, but like Firefox 52 and Serpent, the stability of running these modern web applications (especially the ones patched with kernelxp.dll) on Windows XP RTM can get unstable after a while as it freezes or crashes with c0000005 (Access Violation) error at address 71ad1020. Can somebody try to manage to fix instabilities in what's causing Mypal 68's stability on Windows XP RTM to shake? P.S.: I used Mypal 68 on Windows XP SP1 and no instabilities occurred

I used roytam1's kernelxp.dll to get it to work. I used 4GB of RAM for performance on all Windows XP versions.

December 25, 2026 USP 5.2 should be finished on December 25, 2026 (because it was NOT finished on January 30, 2016).

I finally managed to get Serpent/Mypal 68 to work on Windows XP SP1 (and also SP2). Notes kernelxp.dll stays in the "mypal" and "basilisk" directories after patching, or else it will NOT work. mypal68-xpsp1-code.txt serpent-xpsp1-code.txt

These are the things that should probably work for Windows 2000 USP5.2 (includes Extended Kernel v3.2 and Extended Core v1.7): System: functional Security Center and Windows Firewall (backported from Windows XP SP3) Add SSE3 support (and still keep SSE2 support) Add USB2.0+USB 3.0+USB 3.1+USB 3.2 support for Intel/AMD and other manufacturer motherboards Full exFAT file system support without any unformatted issues Outlook Express 6 SP3 and Internet Explorer 6 SP3 is integrated instead (IE 7 or IE 8 won’t work on Windows 2000, b/c blackwingcat’s attempt from late August 2012 failed) + Windows Media Player 11 integrated (NET Frameworks from 1.0 to 4.0) integrated DirectX 9.0c (June 2010) integrated Support up to 128 GB of RAM (goes with Extended Core) Working VMware Workstation 10.0.7 / VMware Player 6.0.7 drivers (ONLY if Extended Core is installed) Working VirtualBox 5.2.44 drivers (ONLY if Extended Core is installed) Working newer USB ethernet / wireless network adapters (that required Windows XP SP2/SP3) (ONLY if Extended Core is installed) Working Avast Antivirus 18.8.2356 kernel drivers (that required XP SP3) (ONLY if Extended Core is installed) Support Applications: Microsoft Visual Studio 2010 (without license issues) Microsoft Office 2010 (without any installation issues) VirtualBox (up to 5.2.44) VMware Workstation (support up to 10.0.7) and VMware Player (support up to 6.0.7) (without any installation issues) Microsoft Security Essentials 4.2.223 (without any installation issues) Avast Free Antivirus (support up to 18.8.2356) without any installation issues Steam (version for Windows XP) without closing issues Tuneup Utilities 2013 support Windows Live Essentials 2009 (fully works) Windows Powershell 2.0 Adobe Premiere Pro CS4 (without crashing) on Windows 2000 Bugfixes Fixed empty Gadget Gallery "bug" on Windows Sidebar 6.0 for Windows 2000 (even with Extended Kernel) to allow adding gadgets as making it more functional. Functional Rufus 2.18 (to allow creating bootable USB flash drives on Windows 2000) Fixed freezing bug with WindowBlinds 4 (even if PrintWindow function is enabled) Keyboard bugfix (to allow the keyboard to function) for PCEM v17 on Windows 2000 32-bit icons bugfix when using the XP version of Comctl 5.82 when IE6 SP3 for Win2000 has icons Wireless Zero Configuration Utility (backported from XP SP3, functional) BONUS - Windows 2000 USP5.2 Plus (includes KernelEx+Core PLUS!) Chrome 51+ and Firefox 54+ support and Opera 38+ support (for Windows 2000 Extended Kernel Plus! Only)