It allow you to do the following tasks:
- Explore the registry to find the operating system and applications configuration.
- Modify system and applications tweeks not available from the standard options screens.
- Export all or parts of the registry to .reg files.
- Backup and restore the complete registry.
- Perform search on the registry data.

Update Description:
v0.70 (November 10, 2002):
- Registry Backup/Restore
- Better error handling and messages
- Code optimization
- Fixed "New key" duplication when creating new ones before renaming them
- Better UI (horizontal up/down in dword editor)
- More portable, Smartphone Edition is now available

**** [Apr 18, 2008] by Sly using HTC Touch
Works fine on Windows Mobile 6. Install the .msi to your PC. It will try to add the software to the device through ActiveSync, but it won't actually succeed. As the post below says, manually copy the .cab file from your PC to the device and run it on the device.

***** [Feb 25, 2008] by Leo using O2 Zinc WM6
Does it work with WM6 ??? Pls advice, tks.

***** [Feb 18, 2008] by Radu using MIO A 501
It works with Windows mobile 5, Mitac Mio Digiwalker A501. Excellent job to backup the registry.

**** [Dec 31, 2007] by Aytac using imate jasjam
PHM Registry Editor is an old program and the desktop installer does not work on Windows Mobile 5.0. To workaround this; just copy the "regedit.Mrln_ARM.CAB" file from "C:\Program Files\PHM\PHM Registry Editor" on your desktop computer and paste it to your pda. Finally run the .cab file on your pda. http://winzenz.blogspot.com/2006/03/hacking-your-windows-mobile-50.html

*** [Jul 2, 2007] by MASI using Cingular 2125 (pvc c600)
I dwonloaded & installed. No idea how to run it. There was a Windows Icon that did change to "?" after rebooting the device, which reported :Error openning the shortcut or locateding the target filename" on my phone's screen. The editor is in my phone but no idea how to make it work! Help! Thanks

* [Jun 22, 2007] by Lucy using Dell Axim X5
It reads that it is installed on the desktop PC, but in actuality it is not. There is no written instruction on how to install it. There is no place to find out why it isn't working or why I can't find it on my Pocket PC.

***** [May 6, 2007] by db using ASUS
It has find function which works perfectly (Using BitsInside the Pocket PC freezed). Does the job.

***** [Feb 1, 2006] by Pal using XDA SARM
Just downloaded it. Simple nuts-and-bolts program for people who know what they are doing and want control of their devices. Thank you.

***** [Jan 13, 2006] by Alan using Dell Axim x50v
There are products out there for cleaning up your PDA, but sometimes you need a tool for getting deep inside. This tool does the job and I've had no problem with it the past year I've been using it.

**** [Sep 26, 2005] by J.Lee using test
Good tool! But whats about the the import function of this tool. It isnt still realised and it wont be, I think. But its still a goot tool, and its free.

***** [Jun 6, 2005] by dj freak using Ipaq 3715
Excellent tool. I use it a lot to tweak my ipaq. For a list of tweaks you can check out www.pocketpctweaks.com!

***** [Jan 3, 2005] by Just me using h220 Ipaq
This is a tool needed by all pocket pc users. It lets use edit the reg files just as uou would on a any other windows machine. I use this to simply clean out the programs I have uninstalled but where not all reg data was removed. For this itself is justice enough to download this application. As far as I know it works with atleast all iPaq Pocket PC. As I have used it on 4 different models so far all running Windows Mobile 2003.