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PPTX PPTX (Document)

File extension .pptx
Category Document File
Description As part of Microsoft's 2007 suite another open XML document type was introduced. This time in the PowerPoint sphere, PPTX is a Presentation format that stores slides used for slide shows or presentations; like a normal PPT format it may include text, images, and other media; however PPTX is based on the Open XML format and uses ZIP compression for smaller file sizes
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Technical Details A PPTX file is quite unique. The specifications for PPTX are in the ECMA-376 standard for Office Open XML. You can make a PPTX file by zipping up a directory, but the material in the directory has to match an OPC structure, including subfolders that have the content in XML format. Any application that supports XML can access and work with data in the new file format. Just like the DOCX file format, PPTX improves file and data management and data recovery.
Associated programs
  • Apple Keynote
  • OpenOffice
  • Microsoft PowerPoint
Developed by Microsoft
MIME type
  • application/vnd.openxmlformats-officedocument.presentationml.presentation
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PNG PNG (Image)

File extension .png
Category Image File
Description PNG pronounced ping is a format for storing bitmapped (raster) images on computers. It was created originally to replace the GIF file format when it was announced that the companies who created the GIF format wanted royalties. PNG uses indexed colors and lossless compression (like a .GIF file), but without those copyright limitations; it cannot be animated like a GIF image.
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Technical Details PNG images are in many ways better than .GIF as they also include an 8-bit transparency channel, which allows the colors in the image to fade from opaque to transparent; GIF images only support fully opaque or fully transparent pixels. PNG supports palettes of 24-bit RGB colors, RGB images or greyscale or RGB images. PNG was intended to be able to transfer images on the Internet, not professional graphics, and so does not support other colour spaces (such as CMYK).
Associated programs
  • Apple Preview
  • Safari
  • Microsoft Windows Photo Gallery Viewer
  • Corel Paint Shop Pro
  • GIMP - The GNU Image Manipulation Program (LINUX)
Developed by PNG Development Group
MIME type
  • image/png
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