With this dll you can realize a really fast web access for your online-documents. In a batch-process you can copy a small part from your big documents... perhaps the title page and the index. This small documents will contain links to the big one. If someone find the small file interest enough he can klick on the link and the big file opens. So nobody have to wait opening or download the big files and recognize then that its not so interesting for him.This dll doesnt have an entry point so its not necessary to register it. Only copying into the system32-directory or in the directory where your application is installed. If youre using vba (from ms access or excel for example) you should declare the functions as private and not public. Using .NET-environments (like MS Visual Studio) its often better (to avoid stack imbalance errors) to change the parameter-types from longinteger to integer.