Opening _PDF files

Did your computer fail to open a _PDF file? We explain what _PDF files are and recommend software that we know can open or convert your _PDF files.

What is a _PDF file?

These _PDF files are generated by Microsoft Live Mail. This software sometimes changes the extension of PDF files from the standard .pdf extension to _pdf.This usually happens when the PDF file has a dot (.) at the end of the file name and another dot for the extension. Because a dot should separate the file name from the extension, some programs like Windows Live Mail may change the dot of the extension to an underscore in instances where there are two dots before the extension.Other users claim that Microsoft Live Mail and newer versions of Internet Explorer may sometimes do this upon transmitting PDF documents to and from the Internet, even if there is only one dot before the extension. To open _PDF files, simply rename the PDF document to a standard .pdf file. This means you must delete the underscore () and ensure that there is only one dot before the PDF extension.

Try a universal file viewer

In addition to the products listed above, I would suggest that you try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and very likely yours too! Download Free File Viewer.

By Prof. Jones (The File Expert)

Chief Content Editor and File Expert

Suggestions for this page? Mail me.