File Extension SLDX

  • Full name
    Microsoft PowerPoint 2007/2010 Open XML Slide
  • Developer
    Microsoft Corporation
Have you encountered a problem with a SLDX file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a SLDX file here. In the further part of this page we have added a list of programs that should open your SLDX file. It is enough you choose a proper application for your operating system, download and install it.


The extension SLDX identifies a file containing slides in the Office Open XML format of the Microsoft PowerPoint presentation software as of version 2007 (Mac 2008). These files can contain text, tables, images, audio and video data. The slides can be inserted into a presentation by inserting an object. Files containing macros are marked with the extension sldm.

SLDX is an XML-based file format (Office Open XML) that is unreadable with earlier versions of PowerPoint. For the Office versions 2000, 2003 and XP, this functionality can be remedied with the help of the Microsoft Office Compatibility Pack, whereby the result of an imported SLDX file does not always have to correspond to 100% of the original.

An SLDX file consists of several XML files, which are automatically summarized as archives when saved with the ZIP algorithm. This saves space compared to the old format. Other benefits include better data integrity and easier data recovery in case of data loss.

Programs which can open a SLDX file

How to open a SLDX file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the SLDX file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a SLDX file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support SLDX files. At this point we are looking for disk space where the application was installed in and we can link it with a SLDX file. Since then, our operating system will use the selected program to support all SLDX files.

Other issues

Despite the described problem with SLDX there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the SLDX file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the SLDX file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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