We have already seen how we can use the built-in Reg.exe command-line utility to perform almost all the tasks which you otherwise can with regedit.exe. You can also use Reg.exe to save a registry key to a hive file.
Size of registry key exported using Reg.exe is very large
But if you find that the Reg.exe utility does not compress a registry key when the utility saves a registry key to a hive file, you need to compress the registry key.
When you try to make copies of the registry keys, using the reg save command, when you export the registry key into a hive file, you find that the registry key does not compress the key during the exporting process. As a result, the size of the exported key is very large.
How to compress Registry key
You can use the /c switch in the reg save command to compress the registry key.
For instance, this command will compress the HKLM\System subkey:
reg save hklm\system %windir%\system32\config\system.lkg /y /c
I hope this helps solve your problem.
What is the maximum size of Registry key?
The maximum size of a Windows registry key is 255 characters, excluding the path. Each registry key can contain up to 64,000 subkeys. For values, each registry entry is limited to 1 MB in size. Properly managing registry sizes helps maintain system stability and performance.
What is the difference between regedit.exe and Regedt32 exe?
Regedit.exe and Regedt32.exe are both Registry Editors for Windows. Regedit.exe offers basic editing features, while Regedt32.exe provides more advanced functionality, allowing for detailed registry permissions management. Regedt32 is preferred for complex editing tasks, although newer Windows versions have merged both functionalities into a single regedit.exe tool.
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