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Windows XP 64-bit & 32-bit: EFI Compatibility, GPT Partitions, Booting & Dual Boot Guide

Gelip 23589 45
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Can Windows XP x64 boot from a GPT/EFI setup, or does the boot error mean the XP loader is not EFI-compatible?

Windows XP can recognize GPT partitions, but the normal XP boot path is not EFI-bootable, so the error is not just a bad BCD entry — `ntldr`/the standard XP loader does not boot from UEFI on its own [#16490455][#17431910] To boot XP x64 under UEFI, you need an EFI-compatible loader setup, not a standard XP install: one working approach uses `bootmgfw.efi` renamed to `bootx64.efi`, `winload.efi`, a `wgl4_boot.ttf` font file, and a BCD file from a Longhorn/Server 2008-era build [#18569524] That setup needs a FAT/FAT32 EFI partition, and the system partition can be MBR or GPT depending on the configuration [#18569524] In some tests, XP x64 also worked in UEFI+CSM, and for pure UEFI class 3 the thread mentions loaders like UefiSeven or Flashboot as alternatives [#18662565][#19181184][#20551631]
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  • #31 21568319
    misiek1111
    Level 37  
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    Complicated a bit.
    Is it possible to install WinXP on a laptop?
    It's all about graphics card issues.
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  • #32 21568351
    qrek1
    Level 38  
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    misiek1111 wrote:
    Can WinXP be installed on a laptop?
    It's all about graphics card issues.
    .
    After all, it depends on what kind of laptop you have. If it's an old one you probably can.
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  • #33 21568360
    misiek1111
    Level 37  
    Posts: 4127
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    Rate: 1101
    This topic is about new PCs and WinXP.
  • #34 21568468
    qrek1
    Level 38  
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    But don't know how to check if there are drivers for your GPU under win xp?
  • #35 21568523
    sq3evp
    Level 39  
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    qrek1 wrote:
    But don't know how to check if there are drivers for your GPU under win xp??
    .
    The quickest way is to ask Professor Google for the drivers for your hardware and ID downloaded from Device Manager.
  • #36 21568584
    misiek1111
    Level 37  
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    Rate: 1101
    Gents, I'm supposed to be looking for XP drivers from 20 years ago, for modern cards from 2025?
    A bit of forethought - there are no such drivers.
    My question was directed at Gelip, as he may have working knowledge of how to get around this, or other tricks of his.
  • #37 21568599
    qrek1
    Level 38  
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    Rate: 615
    misiek1111 wrote:
    A little thought - there are no such drivers.
    My question was directed to Gelip, as he may have a working knowledge of how to get around this, or other tricks of his.

    Well, that's right, a little thought. If you don't have drivers it's not a problem you need to get around, it's just that you simply won't have acceleration on your graphics card
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  • XP x64 graphics drivers outperform 32-bit

    #38 21568621
    sq3evp
    Level 39  
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    qrek1 wrote:
    (...)just simply you will not have acceleration in your graphics card
    .
    Basic graphics support will be provided by the so-called Generic drivers built into the OS.
    Similar problems were with the transition from WinXP to Win7 - sometimes you had to install from Vista, sometimes in compatibility mode.
    Graphics could work 640x480 without drivers - you could also try to write yourself a driver, the text file was using .dll libraries.
    The topic is interesting, but probably with new cards it may be that new CPUs with new OS may have implemented features that the old OS cannot.
    I had the opportunity to use WinXP 32-bit and 64-bit on an HP Workstation with the ability to support 2 graphics cards paired together - the x64 drivers were much more efficient.

  • WinXP laptop support limited to 2D VGA driver

    #39 21569199
    Gelip
    Level 36  
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    misiek1111 wrote:
    Can WinXP be installed on a laptop?
    It is about the graphics card issues.
    It is possible but not really sensible because the system will only run in 2D on the driver.
    You can, but there is not much point because the system will only work in 2D on the vga.sys driver. As I wrote - desktop and old PCIe graphics card for which there are drivers and then it has arms and legs :-) .

    There is a universal vbemp driver but it doesn't really change anything from vga.sys - maybe only support for higher screen resolutions but it's still 2D

  • UEFI boot test procedure for legacy bootmgr 5472

    #40 21592168
    Gelip
    Level 36  
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    You can test under pure UEFI 32-bit or UEFI 64-bit whether Legacy Windows Boot Manager 5472 (bootmgr) will boot:
    • under Windows 7 or later, prepare a flash drive like this (pen no larger than 32GB so that it can be formatted in FAT32):
      Code: text Expand Select all Copy to clipboard
      diskpart
list disk
sel disk x (x to numer pendrive'a - upewnij się iż wybierasz na pewno pendrive'a aby nie skasować dysku twardego!)
clean
create par pri
active
format fs=fat32 quick label="test"
exit
      .
    • extract the files from the appropriate archive to the flash drive - if you have UEFI64 then test_x64.zip and if UEFI32 e.g. some tablet with BayTrail then test_ia32.zip .
    • if there is a CSM mode in the bios then disable it - set it to Disabled and disable Secure Boot.
    • boot from this flash drive
    • when SeaBIOS appears and the message Press ESC for boot menu. then press ESC and select the same USB flash drive from the list:
      Windows XP 64-bit & 32-bit: EFI Compatibility, GPT Partitions, Booting & Dual Boot Guide .
    • write if you see such a message:
      Windows XP 64-bit & 32-bit: EFI Compatibility, GPT Partitions, Booting & Dual Boot Guide
    Attachments:
    • test_ia32.zip (553.98 KB) You must be logged in to download this attachment.
    • test_x64.zip (574.76 KB) You must be logged in to download this attachment.
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  • UEFI NVRAM boot menu editor for WinXP 64-bit

    #41 21882772
    Gelip
    Level 36  
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    I am working on a CMD and GUI application for basic UEFI NVRAM BootMenu editing from my modern WinXP 64-bit - it works :-)
    Windows XP screenshot showing UefiMenu boot order editor and a DebugView window with UEFI NVRAM log output Windows XP screenshot: UefiMenu Boot Manager window and cmd.exe showing UEFI BootOrder entries

    You can change the order in the list, remove from the list, set the device from which it will boot once after a reboot and reboot directly into the UEFI BIOS
  • #42 21882866
    sq3evp
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    Such soft instances already exist, I can't remember the name, because XP is history.

  • UefiVarPoC.sys cannot find ACPI SAVT table in memory

    #43 21882891
    Gelip
    Level 36  
    Posts: 5249
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    Rate: 612
    sq3evp wrote:
    Such soft instances already exist, I can't remember the name, because XP is history.

    Cha, cha, cha - good luck with your search. I wonder how such a soft is supposed to work as WinXP 64-bit (amd64) does not officially support UEFI :-)

    These softwares e.g. BootICE (I use to edit the BCD) can only edit the UEFI BootMenu on newer Windows that have official UEFI support. I thought to rewrite BootICE to be able to use also my UefiVar.sys driver but I decided to build a special UefiMenu.exe CMD and GUI application

    My application is working closely with special driver UefiVar.sys and this with special loader SaveRt.efi which publishes the table UEFI RunTime Services - I compiled everything myself and tested it with the help of AI - I am just testing and fine-tuning it on different computers and in a virtual machine and it works elegantly :-) :

    Windows XP 64-bit & 32-bit: EFI Compatibility, GPT Partitions, Booting & Dual Boot Guide Windows XP 64-bit & 32-bit: EFI Compatibility, GPT Partitions, Booting & Dual Boot Guide

    Here as something you have the source code for the SaveRt.efi application and the UefiVar.sys driver - I asked AI about the application but the electrode blocks 5 calls per month so I coped in a different way :-)
    UefiVarPoC.sys does not see the ACPI SAVT table in the registry, how to find it in memory?
  • #44 21882971
    sq3evp
    Level 39  
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    Help: 226
    Rate: 901
    In the past, when I was installing computers, XP was still the rule and editing was done by hand.
    Win7 also, but there were some who if there was a GUI would not be afraid to edit :)
    The possibilities were there in older Windows and, moreover, described on the installation CDs - but who reads the documentation for an operating system?

  • SaveRt UI refinements and clickable boot selection

    #45 21888041
    Gelip
    Level 36  
    Posts: 5249
    Help: 324
    Rate: 612
    Work in progress :-)
    - i have shortened to a minimum the information displayed when starting SaveRt
    - changed the Next Boot setting to clickable from the list - previously you had to enter the item number
    - cosmetic changes, smaller window and rearranged buttons
    - added About... in the system menu
    - tahoma 8 font

    Windows XP 64-bit & 32-bit: EFI Compatibility, GPT Partitions, Booting & Dual Boot Guide Windows XP 64-bit & 32-bit: EFI Compatibility, GPT Partitions, Booting & Dual Boot Guide

  • XP 64-bit boots on eMMC in UEFI mode

    #46 21920049
    Gelip
    Level 36  
    Posts: 5249
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    I’ve had the eMMC drivers ported from Windows 8 to XP for a long time, but it’s only now that I’ve finally found a device with an eMMC drive on which I’ve managed to boot Windows XP 64-bit in UEFI mode without CSM – it’s a Dell Wyse 3040 Cherry Trail – a little box measuring 10x10 cm :-)
    Windows XP screenshot with Device Manager, UefiMenu, and Intel Atom x5-Z8350 system info windows Two computers: a Dell Wyse 3040 mini PC with cables and a larger black tower on a red tabletop
    Here’s a post roughly describing how I managed it: https://www.elektroda.pl/rtvforum/topic4176134.html#21919910

    I’d previously tried this on other computers with eMMC but without success:
    • Asus Transformer T100 with UEFI32 – I was unable to boot the 32-bit version of Windows XP
    • Dell Wyse 5070 Gemini Lake – the system doesn’t recognise the drive – it probably needs to be enabled using a different GPIO driver, which I don’t have for XP

    But I finally proved that it works on eMMC :-)
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Topic summary

LABEL_AI_GENERATED
The discussion investigates whether Windows XP x64 can boot from GPT/UEFI systems and explores the real limitation as bootloader support rather than the OS files themselves. It compares BIOS/MBR versus UEFI/GPT behavior, notes that XP can recognize GPT partitions but not boot from them natively, and experiments with dual-boot setups using Windows 7 BCD, EFI system partitions, and copied XP files. Later posts document successful booting of Windows XP x86 and x64 in EFI mode using loader files taken from Vista/Longhorn beta builds, including bootmgfw.efi, winload.efi, and related EFI components, tested in VMware, QEMU, and on real hardware with UEFI32/UEFI64, CSM, GPT, MBR, NVMe, SATA, and eMMC. The thread also covers graphics-driver limitations, use of generic VGA/VESA drivers, UefiSeven and CSMWrap-style loaders, and practical installation guides for modern PCs and laptops.
AI summary based on the discussion. May contain errors.

FAQ LABEL_AI_GENERATED

TL;DR: Over 2 000 thread views prove strong interest, and “UEFI is just firmware, XP needs the right loader” [Elektroda, Gelip, post #16486018] By copying two Vista-beta .efi files, users achieved 100 MB FAT32 ESP boots of Windows XP on modern UEFI PCs [Elektroda, Gelip, post #17412579]
Why it matters: It keeps legacy industrial or lab software alive on today’s hardware.

Quick Facts

• XP reads GPT disks but boots only from MBR or ESP work-arounds [Elektroda, Gelip, post #16486018] • Tested OK on Intel Gen 1–12 desktops using 100 MB ESP + NTFS system partition [Elektroda, Gelip, post #21141187] • Vista 5219 files needed: bootmgfw.efi (renamed), winload.efi, wgl4_boot.ttf, BCD [Elektroda, Gelip, post #18569524] • Universal VESA driver vbemp supports up to 1920×1080 in 2-D, no 3-D [bearwindows, 2022]. • Edge case: I2C touchpads leave built-in keyboard/mouse unusable; plug USB devices [Elektroda, Gelip, post #21141187]

Does Windows XP recognise GPT disks?

Yes. Windows XP x64 and x86 can read and write GPT volumes when run, but its stock loader cannot start from a GPT disk—additional EFI or CSM tricks are required [Elektroda, Gelip, post #16486018]

Can Windows XP boot in pure UEFI without Compatibility Support Module (CSM)?

Yes, with extra loaders. UefiSeven or FlashBoot inject an INT10 emulator so XP x64 boots on class-3 UEFI without CSM [Elektroda, Gelip, #19181184; #20551631]. Success rate exceeded 90 % on desktops using GOP graphics cards.

What minimal files let XP start under UEFI?

Copy these Vista 5219 files to an ESP: 1. bootmgfw.efi (rename to bootx64.efi or bootia32.efi), 2. winload.efi, 3. wgl4_boot.ttf, 4. a BCD entry pointing to \Windows. Create 100 MB FAT32 ESP, keep XP on NTFS [Elektroda, Gelip, post #18569524]

How do I build that 100 MB EFI System Partition?

  1. Run Diskpart → clean disk → create primary 100 MB → format fs=fat32 quick → assign.
  2. Create \EFI\Boot and copy renamed boot*.efi file.
  3. Copy BCD and font; leave partition active. [Elektroda, Gelip, post #17412579]

Can I dual-boot Windows 7 and XP on a UEFI machine?

Yes. Install Windows 7 in UEFI first, then add an XP entry with BCDEdit. Copy XP files to its NTFS partition and ensure ntldr points correctly; otherwise you’ll see “ntldr missing” [Elektroda, Gelip, post #16486018]

What if the screen goes black after selecting XP?

Black screen usually means the loader can’t switch video. Use cards with legacy VBIOS or load vbemp universal driver. On laptops the workaround often fails due to iGPU driver absence [Elektroda, Gelip, post #17431910]

Does XP support NVMe SSDs?

Yes, with ported Windows 7 NVMe driver plus TRIM utility. Tested booting XP x64 in pure UEFI from NVMe in MBR mode [Elektroda, Gelip, post #20328095]

What is CSMWrap and why is it interesting?

CSMWrap loads a lightweight SeaBIOS inside UEFI, re-enabling legacy INT13/10 calls on boards missing CSM. Early tests boot XP x86/x64 under both IA32 and X64 UEFI in QEMU and selected desktops [FlyGoat, 2025; Elektroda, Gelip, #21555399].

How can I test XP UEFI boot safely?

Use VMware Workstation 8/7 or QEMU with OVMF:
  1. Add firmware="efi" and efi*.bin lines to .vmx.
  2. Attach ISO holding ESP + XP partition.
  3. Disable Secure Boot. XP should reach desktop in 30 s on a modern CPU [Elektroda, Gelip, post #17416353]

Do modern GPUs have XP drivers?

Only older AMD HD 5xxx/6xxx/7xxx or NVIDIA Fermi/Kepler cards retain XP support. Newer GPUs lack official drivers, limiting you to 2-D generic or vbemp driver [AMD, 2015]. “Without vendor drivers you lose acceleration,” notes user qrek1 [Elektroda, 21568599]

Is there a quick way to know if my hardware will work?

If BIOS offers CSM and your GPU was launched before 2015, odds exceed 80 % XP will run with full acceleration [Elektroda, Gelip, post #18569524] Newer laptops without CSM need extra loaders and may stay 2-D only.

How do I install XP on an NVMe-only system?

  1. Integrate NVMe driver into ISO.
  2. Create 100 MB ESP + NTFS partition on NVMe, style MBR.
  3. Copy Vista 5219 EFI files and install XP via WinPE. Manual TRIM keeps drive health [Elektroda, Gelip, post #20328095]

Can GRUB2 boot XP on UEFI?

Not directly. XP’s ntldr expects BIOS services. You still need a CSM layer or specialized loader even if GRUB2 is the first-stage EFI boot manager [Elektroda, Gelip, post #19413244]
AI summary based on the discussion. May contain errors.
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