The AppData folder contains application settings, files and data that is specific to the applications on your PC. The folder is hidden by default in File Explorer, and has three hidden sub-folders: Local, LocalLow and Roaming.
Roaming. This folder (%appdata%) contains data that can move with your user profile from PC to PC – like when you're on a domain – because this data has the ability to sync with a server. For example, if you sign in to a different PC on a domain, your web browser favourites or bookmarks will be available.
Local. This folder (%localappdata%) contains data that can't move with your user profile. This data is typically specific to a PC or too large to sync with a server. For example, web browsers usually store their temporary files here.
LocalLow. This folder (%appdata%/…/locallow) contains data that can't move, but also has a lower level of access. For example, if you're running a web browser in a protected or safe mode, the application will only be able to access data from the LocalLow folder.
The applications themselves choose whether to save to the Local, LocalLow or Roaming folders. Most desktop applications use the Roaming folder by default, while most Windows Store apps use the Local folder by default.
We don't recommend moving, deleting or making any changes to files or folders in the AppData folder. Doing so could make your applications run poorly or stop working entirely.
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