Basic information about PDF_ file

When there is a problem with opening files with the file extension PDF_（*.PDF_ or *.pdf_）, you do not need a computer expert. In most cases, using the helpful suggestions of experts contained in our website as well as appropriate programs, you can solve the problem with the PDF_ file yourself.

There are 1 file types using the PDF_ file extension in our database. In the further part of this page, you will find detail information about all the PDF_ file with their brief description and a list of programs that support PDF_ file sorted by operating systems. The table below provides useful information about the PDF_ file extension. It answers questions such as:
  • What is the PDF_ file?
  • How to open a PDF_ file?
  • What programs do I need to open a PDF_ file?
  • What programs help to create and edit a PDF_ file?
  • How to convert PDF_ files to another file format?
  • How to convert another files to PDF_ file format?


1.Detail information about PDF_ file extension: Adobe Acrobat Portable Document

File type Adobe Acrobat Portable Document Category Page Layout Files
Developer Adobe Systems File format N/A
Description PDF_ file is a Adobe Acrobat Portable Document developed by Adobe Systems. The pdf_ File extension is associated with Adobe Acrobat portable document file format. .

The pdf_ file extension was used on older Apple Mac OS operating systems (Classic MacOS). The original file extension is pdf.
Software programs that will open, edit or convert PDF_ files

Windows		 Adobe Acrobat
Adobe Acrobat Reader
Adobe Creative Suite

macOS		 Adobe Acrobat for Mac
Adobe Acrobat for Mac
Adobe Acrobat Reader for Mac
Adobe Creative Suite for Mac



How to convert PDF_ files to another file format?

There are 2 records in our database eligible for PDF_ files to another file format conversion. If you want to achieve PDF_ to another files conversion, you may use the option.

PDFX to PDF PDF_ to PDF


Can't open a PDF_ file?

When you click a file to open it, operating system examines the filename extension. If operating system recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When operating system does not recognize a filename extension, you receive the following message:

”Can't open this file: example.PDF_”。

To open this file, you install one of the applications from the list of software programs that you found here, you should be able to open, edit or convert the file with the PDF_ extension without any issue.


Where I can download the application that support PDF_ 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 required application. Most often they are the websites of software manufacturers.


How to change file associations?

  • Right-click a file with the extension whose association you want to change, and then click "Open With".
  • In the "Open With" dialog box, click the program whith which you want the file to open, or click "Browse" to locate the program that you want.
  • Select the ”Always use the selected program to open this kind of file” check box.


Can I change the extension of PDF_ files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read/open the file. The problem is, changing the file extension does not change the file format. Select a software program from our list and install it on your computer. If the file has not opened correctly, you have to look for a different software program from our list. Sometimes you have to repeat the operation several times.


What else may cause problems width open a PDF_ file?

The reasons for the lack of the ability to open a PDF_ file on your computer may be at least several. The easiest thing is to find a suitable application installed on your computer, which will open a PDF_ file. If there is still something wrong, you might want to check:

  • Whether the PDF_ file is damaged.
  • Whether the PDF_ file is incorrectly linked in the registry entries.
  • Whether the PDF_ file extension has been accidentally removed from the Windows registry.
  • Whether the installation of an application that supports the PDF_ file format is incompletely.
  • Whether the PDF_ file is infected.
  • Whether the drivers of the equipment used for opening a PDF_ file are up to date.
  • Whether your computer has enough hardware resources to open a PDF_ file.

If the PDF_ file still not working with your software after eliminating the above shortcomings? That means that the problem is more complex and requires the help of a specialist.