BACKUP file extension is used by ISAPI Loader, a software utility for Internet Information Services (IIS) administrators that enables updating ISAPI application and DLL ISAPI libraries without the need of restarting IIS servers. BACKUP file contains backup copy created with ISAPI utility.
BACKUP file data generated by ISAPI application are saved automatically. BACKUP file is used to restore main files to previous state in case of file loss or other failure.
We hope we helped you solve the problem with the BACKUP file. If you do not know where you can download the application from our list, click on the link (which is the name of the program) - you will find more information there on the location where to download the secure setup version of the required application.
There can be more reasons which determine that you are not able to open the BACKUP file (apart from the lack of the proper application installed).
First - the BACKUP file may be incorrectly associated with the application installed to support it. In this case, you need to change this association by yourself. To do this, right-click on the BACKUP file that you want to edit, click "Open with" and then select the program from the list that you have installed. After this operation, the problems with opening the BACKUP file should be solved.
Second - the file you want to open can simply be damaged. Then, the best solution is to find a new version of given file, or download it again from the same source as before (maybe for some reason in the previous session the download of the BACKUP file has not been completed and it cannot be opened properly).
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