It sounds like you're highlighting a of Adobe Reader (or Acrobat) related to its ActiveX control download.
Display PDF files directly within your application interface. adobe reader activex download
To understand the download process, one must first understand the technology. ActiveX is a Microsoft framework that allows software components to be reused within different applications, primarily within Internet Explorer and Windows desktop applications. The Adobe Reader ActiveX control ( AcroPDF.dll ) is a component that allows a developer to embed a PDF viewer directly into a program. This provides a seamless user experience where a PDF opens within the application window, complete with the Adobe Reader toolbar and navigation features, rather than launching as a separate window. It sounds like you're highlighting a of Adobe
Some versions prevent users from modifying the PDF file directly, protecting document integrity. How to Create "Extended Features" (Reader Enabling) ActiveX is a Microsoft framework that allows software
Furthermore, the industry trend is moving away from this method of integration. Microsoft Edge and Google Chrome do not support ActiveX, relying instead on their own built-in PDF viewers or the modern Adobe Acrobat extension. For modern applications, developers are encouraged to use the Adobe PDF Embed API, which offers a secure, JavaScript-based method to display PDFs without relying on legacy system dependencies.
To allow your end-users to use advanced tools (like "long text" fields or saving filled forms) within an ActiveX-embedded window, you must "Extend" the PDF using before it is loaded. Acrobat Version Path to Enable Extended Features Acrobat DC / Pro XI
For users seeking to view or interact with PDF documents within specialized Windows applications or legacy web environments, the is a critical component. This control allows developers to embed the standard Adobe Acrobat Reader interface directly into their own software or web forms, providing familiar navigation and printing capabilities. How to Download the Adobe Reader ActiveX Control