iOS Application Archive File
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What is a SINF file?
Data file used by iOS applications; contains DRM data about iTunes authorization, such as the username; often discovered by users of jailbroken iPhones or applications like iFunBox, a desktop file explorer for iPhone.
The SINF file is located with the .SUPP file inside the "SC_Info" folder within the mobile application.
Common SINF Filenames
[Application Name].sinf - The name of the SINF file will be the same as the name of the application.