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Webbrowsers Index File Types

It is important to know which type of index file to use for maximum effect in your business.

 The most common online marketing index file types include:

   1. AdobePortable Document Format (.pdf)

   2. AdobePost Script (.ps)

   3. Atom and RSS feeds (.atom, .rss)

   4. Autodesk Design Web Format (.dwf)

   5. Google Earth (.kml, .kmz)

   6. Lotus 1-2-3 (.wk1, .wk2, .wk3, .wk4, .wk5, .wki, .wks, .wku)

   7. Lotus WordPro (.lwp)

   8. MacWrite(.mw)

   9. Microsoft Excel (.xls)

  10. Microsoft PowerPoint (.ppt)

  11. Microsoft Word (.doc)

  12. Microsoft Works (.wks, .wps, .wdb)

  13. Microsoft Write (.wri)

  14. Open Document Format (.odt)

  15. Rich Text Format (.rtf)

  16. Shockwave Flash (.swf)

  17. Text (.ans, .txt)

  18. Wireless Markup Language (.wml, .wap)

Flash and other rich media files

Search engines are usually text based and in order to be crawled and indexed, your online marketing content needs to be in text format. (Google can now index text content contained in Flash files, but other search engines may not.)

Any content you embed in Video files should also be available in text format or it will not be accessible to search engines. Remember to provide text index file equivalents for all non-text files.

This will increase Googlebots ability to successfully crawl and index your online marketing content and it will also make your content more accessible. For example users with visual impairments, who use screen readers, or have low bandwidth connections, cannot see images on web pages, and providing text equivalents widens your audience.

Google can now discover and index text content in SWF files of all kinds, including self-contained Flash websites and Flash gadgets such as buttons or menus. This includes all textual online marketing content visible to the user. Google supports common JavaScript techniques. In addition, they can now find and follow URLs embedded in Flash files. There is no guarantee that browsers will crawl or index file the content, Flash or otherwise.

Flash files with an HTML file, or XML file, or another SWF file will not consider the content of these files to be part of the content in your Flash files. Text-based equivalents of these files can help most search engines crawl and index your content. In addition, a text-based version of your site will let viewers using older browsers or mobile phones access your content more easily.

sIFR (an open-source project) lets webmasters replace text elements with Flash equivalents. Using this technique, content and navigation is displayed by an embedded Flash object but, because the content is contained in the HTML source, it can be read by non-Flash users (including search engines).

Silverlight and other rich media formats

Google can crawl and index file the text content of Flash files, but we still have problems accessing the content of other rich media formats such as Silverlight. These rich media formats are very visual, which can cause some problems for Googlebot. Unlike some Internet spiders, Googlebot can read some rich media files and extract the text file and links in them, but the structure and context are missing. Also, rich media designers often include content in the form of graphics, and because Google can not detect words included in graphics, it can miss important keywords.


Googlebot cannot crawl the content of video files, so it's important that you provide information about videos you include. Consider creating a transcript of the video you want to include, or provide a detailed description of the video inside your HTML. If you have video content, you can host it on Google Video, YouTube, or a number of other video hosting providers.

IFrames are sometimes used to display online marketing content on web pages. Content displayed via iFrames may not be indexed and available to appear in Google's search results. If you do include iFrames, make sure to provide additional text-based links to the content they display, so that Googlebot can crawl and index file this content.

Use HTML for content and navigation. This makes your site more Google-friendly, and also makes it accessible to a larger audience. This  includes, readers with visual impairments that require the use of screen readers, users of old or non-standard browsers, and those with limited or low-bandwidth connections such as a cellphone or mobile device.

Provide text versions of pages. Silverlight is often used as a splash screen on the home page, where the root URL of a website has a rich media intro that links to HTML content deeper into the site. If you use this approach on your website, make sure there is a regular HTML link on that front page to a text-based page where a user (or Googlebot) can navigate throughout your site without the need for rich media.

You may have noticed that the text on the central webpage is larger than normal. This is optimised for people with visual disabilities.

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