What is an update file and how do I open an update file?
UPDATE is a file used by ISAPI Loader, a program that allows DLLs to be hot-swapped on a Microsoft IIS web server during execution. It contains updated DLL file contents for the Web server, and is automatically recognized and updated by ISAPI Loader.
These ISAPI update files are also implemented with data encoding specifications used for saving the data of an ISAPI update file in the UPDATE format. Affixed with the .update extension, an ISAPI update file is used by the ISAPI Loader application, which was developed by EggCentric as a program integrated with functionality that can enable currently running applications to be "hot-swapped" in a Microsoft IIS Web server. The updated Dynamic Link Libraries stored in an ISAPI update file are used to update the Microsoft IIS Web server, and these DLLs are automatically detected and initialized by the ISAPI Loader program. The extension of a DLL in an ISAPI update file is required to be changed to the RUN file extension before the ISAPI Loader software can use the ISAPI update file to update the Microsoft IIS Web server.
Relevant update file links:How to open update file on Youtube
How to open update file on Wikipedia
How to open update file on Microsoft.com