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.xlm – Legacy Excel macro; OOXML Office Open XML (OOXML) format was introduced with Microsoft Office 2007 and became the default format of Microsoft Excel ever since. Excel-related file extensions of this format include:.xlsx – Excel workbook.xlsm – Excel macro-enabled workbook; same as xlsx but may contain macros and scripts
Excel 2007 formats Format Extension Description Excel Workbook .xlsx: The default Excel 2007 and later workbook format. In reality, a ZIP compressed archive with a directory structure of XML text documents. Functions as the primary replacement for the former binary .xls format, although it does not support Excel macros for security reasons.
OASIS Open Document Format for Office Applications (OpenDocument) v1.3 Latest ISO/IEC standardised version ISO/IEC IS 29500-1:2012—Office Open XML File Formats [1] ISO/IEC IS 26300-1:2015—Open Document Format for Office Applications (OpenDocument) v1.2 [2] Language type Markup language Markup language XML schema representation
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The new XML-based document file format in Microsoft Office 2007 is incompatible with previous versions of Microsoft Office unless an add-on is installed for the older version. [111] PC World has stated that upgrading to Office 2007 presents dangers to certain data, such as templates, macros, and mail messages. [112]
Microsoft Access stores data in its own format based on the Access Database Engine (formerly Jet Database Engine). It can also import or link directly to data stored in other applications and databases. [6] Software developers, data architects and power users can use Microsoft Access to develop application software.
It is also possible to set up Query so that if the original source of data is updated, the Excel document will also be updated accordingly. However, to take full advantage of this new feature, the download of separate ODBC drivers is required because Query can not access the outside source's data without them. [6] Microsoft Works 4.0 converter
Excel's storage of numbers in binary format also affects its accuracy. [3] To illustrate, the lower figure tabulates the simple addition 1 + x − 1 for several values of x. All the values of x begin at the 15 th decimal, so Excel must take them into account. Before calculating the sum 1 + x, Excel first approximates x as a binary number