1DMBAK File

What are 1DMBAK files and how to open them

Are you having problems opening a 1DMBAK file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your 1DMBAK files.

What is a 1DMBAK file?

A .1DMBAK file is a 1DM Backup file.

The 1DM Backup format is used by the Android app 1DM (originally called IDM+ / Internet Download Manager), to export and restore user data such as bookmarks, settings, browsing history, and download lists. The app creates such backups when users select "Export data" in its settings; later the same app can re-import them via "Import data".

These .1DMBAK files are intended only for 1DM and are not standard archives or configuration formats readable by typical desktop tools. You will see them on your device if you've explicitly backed up data from 1DM; restoring requires using 1DM's "Import data" function.

Technically, a .1DMBAK file is a ZIP-based archive (it begins with the bytes 0x50 0x4B 0x03 0x04 at the very start), and contains internal files including "KEY_BOOKMARKS.JSONPK" among others. At offset 33 there is a byte 0x5F ("_").

How to open 1DMBAK files

Important: Different programs may use files with the 1DMBAK file extension for different purposes, so unless you are sure which format your 1DMBAK file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 14, 2026

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about 1DMBAK file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.