It is a type of file used by the ISAPI Loader, a program that allows DLLs to be "hot swapped" on a Microsoft IIS web server at run time.
It has contents of DLL files updated for the web server and which in turn are automatically recognized and updated by the ISAPI Loader.
ISAPI is an application programming interface (API) for Microsoft's IIS, and enables programmers to develop web-based applications that process much faster than CGI programs.
The ISAPI loader, which stands for Internet Server Application Programming Interface, requires that all updatable DLL files be renamed with the RUN extension. Upon discovering a new UPDATE file, it terminates current web server requests, contains new web server requests, changes the existing RUN file to use the BACKUP extension, and resumes web server operations normally.
If you downloaded a UPDATE file on Android device you can open it by following steps below:
To open UPDATE File on iOS device follow steps below:
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