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docs: add the "Troubleshooting" section for windows-9x.md

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SuperMaxusa 2025-10-07 12:25:28 +03:00 • committed by Fabian
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@ -23,11 +23,41 @@ qemu-system-i386 -m 128 -M pc,acpi=off -drive file=hdd.img,format=raw
4. To change floppy disk, press *Ctrl+Alt+2* to switch to the QEMU Monitor, run `change floppy0 /path/to/new_floppy_image` and press *Ctrl+Alt+1* to switch to VGA.
5. Follow the installation guide on the screen.
6. (optionally) If "Windows protection" errors appears on startup, apply [FIX95CPU](http://lonecrusader.x10host.com/fix95cpu.html) or [patcher9x](https://github.com/JHRobotics/patcher9x#installation).
> [!TIP]
> For transfer files from host to guest, use [genisoimage](https://wiki.debian.org/genisoimage) ([UltraISO](https://www.ultraiso.com/) and [PowerISO](https://www.poweriso.com/) for Windows and Mac) for creating CD-ISO image or [dosfstools](https://github.com/dosfstools/dosfstools) ([WinImage](https://www.winimage.com/download.htm) for Windows) for creating floppy disk images, then mount the created image to QEMU.
## Troubleshooting
### "Windows protection" errors during startup
Apply [FIX95CPU](http://lonecrusader.x10host.com/fix95cpu.html) or [patcher9x](https://github.com/JHRobotics/patcher9x#installation).
### "VFBACKUP could no load VFD.VXD" on startup (Windows 95)
**Workaround #1**:
*Source: [#1185](https://github.com/copy/v86/issues/1185)*
1. Mount the installation CD (or `Disk 3` for the RTM version on floppy disks).
2. Open the "MS-DOS prompt" and run:
For the CD version:
```bat
extract /a /l C:\Windows\System <cd-rom letter>:\WIN95\WIN95_02.CAB vfd.vxd
```
For the floppy version:
```bat
extract /a /l C:\Windows\System <floppy drive letter>:\WIN95_03.CAB vfd.vxd
```
**Workaround #2**:
*Source: [#289](https://github.com/copy/v86/issues/289)*
1. Open the Start menu, click on "Run" and run `sysedit`.
2. Find `C:\AUTOEXEC.BAT` and add `smartdrv` to the top of the file.
3. Press File -> Save.
## Floppy disk support
Currently, the floppy drive in v86 works only with MS-DOS compatibility mode.