The XHTML file extension is a stricter and cleaner reformulation of the HTML code, the basic building block of webpage creation, and has two main components:
- HTML 4 – a markup language used to create displays of text, hypertext, multimedia and other documents for use across a range of different platforms and operating systems
- XML – this is a more versatile markup language that retains the power and flexibility of the original HTML code, but reduces its leniency and complexity, making a more simplified and rigorous code.
One of the main problems inherent with the original HTML was its leniency, which allowed browsers to interpret the HTML codes in a variety of ways, resulting in unconformities in the way webpages were displayed across different systems. The XHMTL code does not allow this, and webpages written in this coding will be displayed exactly how they were designed, regardless of the browser technology interpreting them.
You can convert existing HTML into XHTML by following a few basic re-writing rules:
1) XHTML validator - this will scan your HTML tags and attributes and alert you to the codes that need changing in order to fully convert to XHTML.
2) Always use end tags – in HTML end tags were not always required, but they are necessary in XHTML such as the paragraph <p> and line break tag <br/>.
3) Correct any overlapping elements - nested codes should open and close with the same tag to avoid overlapping such as: <p>Paragraph <em>emphasized</em></p>
3) Case Sensitive – XHTML is a case-sensitive markup language so the same tag written in upper and lower can actually be two different tags i.e. <em> and <EM>.
Another type of file extension is wpd files. This indicates the WordPerfect format, which is a word processing program produced by Corel. In the late 1980s and early 1990s it was the main word processing application used throughout the world, but in recent years it has been overtaken by Microsoft Word. WordPerfect’s popularity was based mainly on the fact that unlike Microsoft Word it could be used on a wide variety of platforms and operating systems including Mac OS and Linux.
The version WordPerfect 4.2 released in 1986 featured the first automatic paragraph numbering and footnoting functions in a word processing document, which presented an easy way to produce professional looking typeset documents and was invaluable to the academic, office and law markets. However Corel never truly got to grips with releasing a version of WordPerfect that was completely compatible with the Microsoft Windows operating system, and its 1996 release WordPerfect 7 had major stability issues. Once Microsoft began issuing its new computers with the Microsoft Word program already installed, Corel lost its majority share of the market and now mainly caters to law and academic fields that have a preference for specific WordPerfect features such as macro/scripting and reveal codes. 
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