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Convert XLS to HTML4 - Convert your file now - online and free - this page also contains information on the XLS and HTML4 file extensions.

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File extension.xls
CategoryDocument File
DescriptionMicrosoft Excel is a commercial spreadsheet application written and distributed by Microsoft for Microsoft Windows and Mac OS X. Pre-2007 versions of Excel use XLS as the primary format for saving files. It features calculation, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications. It has been a very widely applied spreadsheet for these platforms, especially since version 5 in 1993, and it has almost completely replaced Lotus 1-2-3 as the industry standard for spreadsheets. Excel forms part of Microsoft Office. The current versions are 2010 for Microsoft Windows and 2011 for Mac OS X.
Actions XLS to HTML4 - Convert file now
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Technical DetailsMicrosoft Excel up until 2007 version used a proprietary binary file format called Binary Interchange File Format (BIFF) as its primary format. Used as the basis for XLS files it is a persistence format that supports authoring and manipulating content in workbooks and workbook templates. Most versions of Microsoft Excel can read CSV, DBF, SYLK, DIF, and other legacy formats.
Associated programs Microsoft Excel
Microsoft Excel Viewer
Developed by Microsoft
MIME type  application/vnd.ms-excel
Useful links More detail about the XLS format
How to open an XLS file without Microsoft Excel
Microsoft Office binary file format specifications
Convert XLS file

Convert XLS file

Using Zamzar it is possible to convert XLS files to a variety of other formats:

xls to bmp (Windows bitmap)
xls to csv (Comma Separated Values)
xls to gif (Compuserve graphics interchange)
xls to html (Hypertext Markup Language)
xls to html4 (Hypertext Markup Language)
xls to html5 (Hypertext Markup Language)
xls to jpg (JPEG compliant image)
xls to mdb (Microsoft Access Database)
xls to numbers (Apple iWork Numbers Spreadsheet)
xls to numbers09 (Apple iWork '09 Numbers Spreadsheet)
xls to ods (OpenDocument spreadsheet)
xls to pdf (Portable Document Format)
xls to png (Portable Network Graphic)
xls to rtf (Rich Text Format)
xls to tiff (Tagged image file format)
xls to txt (Text Document)
xls to xlsx (Microsoft Excel 2007 Spreadsheet)
xls to xml (Extensible Markup Language)

XLS to HTML4 - Convert file now

Convert xls to html4

File extension.html4
CategoryDocument File
DescriptionHTML4 has been superceded by HTML5, however still plays an important role in the history of HTML. HTML4 was the first version to include cascading style sheets (css), and these were changed further in HTML5 which included more presentational elements - HTML4 led the way here.
Actions XLS to HTML4 - Convert file now
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Technical DetailsHTML 4.01 was published in late 1999 as a W3C Recommendation. It offers three variations: Strict, in which deprecated elements are forbidden, Transitional, in which deprecated elements are allowed and Frameset, in which mostly only frame related elements are allowed. XHTML is a separate language that began as a reformulation of HTML 4.01 using XML 1.0. It is no longer being developed as a separate standard. Most presentational markup elements were deprecated under the HTML 4.0 specification in favor of using CSS for styling.
Associated programs Any Web Browser (e.g. Internet Explorer, Safari, Firefox, Google Chrome)
Developed by World Wide Web Consortium & WHATWG
MIME type  text/html
Useful links More detailed information on HTML4 files
How can I edit a HTML file ?
Convert HTML4 file