Preference and other file locations | Lighroom 3.x

• Do not delete database files.
• Do not delete Lightroom 3 catalog files that end in -journal. Journal files are temporary files that allow the database to be recovered in a crash.
• If possible, back up files on a different hard disk or volume from the disk where your catalog is located. For more information on backing up in Lightroom, see Backing up the catalog in Lightroom Help.

• The Photoshop Lightroom application is the Adobe Lightroom 3.app file, located in the Applications folder.
• The preferences file is the com.adobe.Lightroom3.plist file, located in [user name]/Library/Preferences.The [user name]/Pictures/Lightroom folder contains:
• Lightroom 3 Catalog.lrcat, the Lightroom database file
• Lightroom 3 Catalog.lrcat.lock, which prevents you from overwriting data
• Lightroom 3 Catalog Previews.lrdata. which contains preview data for your photos

• Catalog backups are saved to [user name]/[catalog location]/[catalog name]/Backups/.
• Installed and custom presets and templates have filenames ending in .lrtemplate and are located in the [user name]/Library/Application Support/Adobe/Lightroom folder.
• Registration data is in Library/Application Support/Adobe/Lightroom/.

Important: Apple made the user library folder hidden by default with the release of Mac OS X 10.7. If you need access to files in the hidden library folder to perform Adobe-related troubleshooting, see How to access hidden user library files.

• The Photoshop Lightroom application is the Lightroom.exe file, located in the Program Files/Adobe/Adobe Photoshop Lightroom 3 folder. 
• The preferences file is Lightroom 3 Preferences.agprefs, located in Documents and Settings/[user name]/Application Data/Adobe/Lightroom/Preferences. 
• The Documents and Settings/[user name]/My Documents/My Pictures/Lightroom folder contains:
  • Lightroom 3 Catalog.lrcat, the Lightroom database file
  • Lightroom 3 Catalog.lrcat.lock, which prevents you from overwriting data
  • The Lightroom 3 Catalog Previews.lrdata folder, which contains additional folders for preview files and data
• Catalog backups are saved in Documents and Settings/[user name]/[catalog location]/[catalog name]/Backups/. 

• Installed and custom presets and templates have filenames ending in .lrtemplate and are located in folders in the Documents and Settings/[user name]/Application Data/Adobe/Lightroom folder.
• Registration information is located in the C:\ProgramData\Adobe\Lightroom\Lightroom 3.0 Registration.lrreg file. Lightroom 3 reads the Lightroom 2.0 or 1.0 registration registry entry when it validates upgrade serial numbers. If you upgrade and Lightroom 3 does not find a registry entry for either Lightroom 2.0 or 1.0, it prompts you for a serial number. 

• The Photoshop Lightroom application is the Lightroom.exe file, located in the Program Files/Adobe/Adobe Photoshop Lightroom 3 folder. 
• The preferences file is Lightroom 3 Preferences.agprefs, located in Users/[user name]/AppData/Roaming/Adobe/Lightroom/Preferences/.
• The Users/[user name]/Pictures/Lightroom folder contains:
  • Lightroom 3 Catalog.lrcat, the Photoshop Lightroom database file
  • Lightroom 3 Catalog.lrcat.lock, which prevents you from overwriting data
  • The Lightroom 3 Catalog Previews.lrdata folder, which contains additional folders for preview files and data

• Catalog backups are saved in Documents and Settings/[user name]/[catalog location]/[catalog name]/Backups/. 
• Installed and custom presets and templates have filenames ending in .lrtemplate and are located in folders in the Users/[user name]/AppData/Roaming/Adobe/Lightroom folder. 
• Registration data is located in the C:/ProgramData/Adobe/Lightroom/Lightroom 3.0 Registration.lrreg file. Lightroom 3 reads the Lightroom 2.0 or 1.0 registration registry entry when it validates upgrade serial numbers. If you upgrade and Lightroom 3 does not find a registry entry for either Lightroom 2.0 or 1.0, it prompts you for a serial number.

• The Photoshop Lightroom application is the Lightroom.exe file, located in the Program Files/Adobe/Adobe Photoshop Lightroom 3 folder.
• The preferences file is Lightroom 3 Preferences.agprefs, located in 
  
  Users/[user name]/AppData/Roaming/Adobe/Lightroom/Preferences/.
• The Users/[user name]/My Pictures/Lightroom folder contains:
  • Lightroom 3 Catalog.lrcat, the Photoshop Lightroom database file
  • Lightroom 3 Catalog.lrcat.lock, which prevents you from overwriting data
  • The Lightroom 3 Catalog Previews.lrdata folder, which contains additional folders for preview files and data
• Catalog backups are saved in Users/[user name]/[catalog location]/[catalog name]/Backups/.
• Installed and custom presets and templates have filenames ending in .lrtemplate and are located in folders under the Users/[user name]/AppData/Roaming/Adobe/Lightroom folder.
• Registration data is located in the C:/ProgramData/Adobe/Lightroom/Lightroom 3.0 Registration.lrreg file. Lightroom 3 reads the Lightroom 2.0 or 1.0 registration registry entry when it validates upgrade serial numbers. If you upgrade and Lightroom 3 does not find a registry entry for either Lightroom 2.0 or 1.0, it prompts you for a serial number.