GRUB4DOS internal loader data
File type: Various data file
The grldr file extension identifies internal loader data used by GRUB4DOS.
A grldr file is a bootloader component, not a document intended for use in a regular desktop application.
File type category:
Various data file
Date updated: October 16, 2026
GRUB4DOS is a bootloader project that can start and chain-load various operating systems. The grldr file is one of its core loader files.
The grldr file contains the internal loader data and executable bootloader code required by GRUB4DOS. It is used together with the GRUB4DOS boot configuration, commonly including a menu.lst file.
GRUB4DOS is used in PC boot environments, including DOS, Windows and Linux boot setups. The file is intended to be loaded during the boot process rather than opened or edited as ordinary data.
A grldr file is not opened with a desktop application. It should be placed in the location required by a GRUB4DOS installation and loaded by the computer's boot process.
Use the GRUB4DOS installation or boot-management procedure for the relevant system. Do not rename, edit or delete the file if it is part of an active boot setup.
The grldr format is a bootloader file and cannot be meaningfully converted to a common document or data format.
To use a different GRUB4DOS loader, replace the file with the corresponding file from a compatible GRUB4DOS distribution or installation. Keep the boot configuration and loader files matched.
Software applications that handle other tasks involving grldr files:
Multiplatform
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