| Windows Registry Data Format | |
| Microsoft | |
| Ads |
REG is a system file responsible for adding registry keys or changing register values in Microsoft Windows operating system. REG file syntax contains information about version of registry editor, file path, data element name, type of added values and corresponding data, typically in binary format
REG files are handled regedit.exe tool. Before applying any changes to the registry it is strongly adviced to create system backup copy or registry copy by using ‘Export’ command available in the ‘File’ submenu.
Windows
Microsoft Registry Editor 
NotePad++ 
Microsoft Windows NotePad 
Registrar Registry Manager - RegAlyzer
- RegmagiK Registry Editor
- Ryll Registry Editor
- Advanced Regedit
- Registry Workshop
- Reg Organizer
RegistryBooster - Registry Mechanic
- Eusing Free Registry Cleaner
- Windows Registry Recovery
- Aiseesoft Registry Optimizer
- WinASO Registry Optimizer
- Advanced Registry Care
- Registry First Aid
- Wise Registry Cleaner Professional
- Smart Registry Cleaner
Microsoft Windows - Free Registry Defrag
| .adm | Administrator Policy Template Format |
| .adml | Microsoft Administrative Language-specific XML Template Format |
| .admx | Microsoft Administrative XML Template Format |
| .aml | Microsoft Assistance Markup Language |
| .ani | Animated Cursor |
| .ann | Microsoft Windows Help Annotation Format |
| .aos | Archos Signed Encrypted Data Format |
| .asec | Google Android Encrypted Application Package Format |