Having problems opening a _PDF file?

We have programs that can open or convert your _PDF files.

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

Try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and most likely yours too. Download Free File Viewer here.

About File Extension _PDF

File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.

If you have additional information about the _PDF file format or software that uses files with the _PDF suffix, please do get in touch - we would love hearing from you.