UPGRADE extension files are files used by various software packages and Operating Systems as data files where downloaded updates and patches are stored for later installation.
UPGRADE extension files are binary files and it is not recommended to open them manually, by the user.
Said UPGRADE files are not editable or configurable by the user.
An example of the use of UPGRADE files is the N-Tier API, ISAPI.
The Internet Server Application Programming Interface (ISAPI) is a multi-level API of Internet Information Services (IIS), which is a collection of Microsoft and Windows-based web services.
If you downloaded a UPGRADE file on Android device you can open it by following steps below:
To open UPGRADE File on iOS device follow steps below:
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