"The correct answer is .doc. Key Points The file extension .doc is used by Microsoft Word for its document files. It was the default file format for Word documents until the introduction of the .docx format in later versions. .pdf (Portable Document Format) is used for documents that are read-only and universally viewable, not for editing in Word. .html is the file extension for web pages and is associated with web development, not word processing. .txt is used for plain text files, which do not include formatting or advanced features found in Word documents. .doc remains compatible with many earlier versions of Microsoft Word and other word processing software. Additional Information File Extensions in Microsoft Word: .docx: Introduced with Word 2007, this is the default format for Word documents in newer versions. It uses XML for improved file compression and data recovery. .doc: The legacy format used in older versions of Microsoft Word (prior to Word 2007). Comparison of File Extensions: .doc: Smaller file size and compatible with older software versions. .docx: Better compression, enhanced features, and improved security. Tips for Working with Word Files: Always save important documents in the .docx format for better compatibility and advanced features. Use the .pdf format to share documents while preserving formatting and preventing editing. Consider converting older .doc files to .docx to take advantage of newer Word features."

The extension for Microsoft Word files is typically ".docx".I hope it helpsplease mark as brainliest ❣️‼️

"The correct answer is .doc. Key Points The DOCX and DOC file extensions are used for Microsoft Word documents, part of the Microsoft Office Suite of software. XLSM is the file extension that is assigned to spreadsheets created by Microsoft Excel 2007 and newer. They are saved using the Open XML standard.  PNG is short for Portable Network Graphic, a type of raster image file. It's particularly popular file type with web designers because it can handle graphics with transparent or semi-transparent backgrounds. A TXT file is a standard text document that contains plain text. It can be opened and edited in any text-editing or word-processing program. "

"The correct answer is .doc. Key Points .doc and .docx are file extensions used for Microsoft Word documents, representing text-based files. The .doc extension was primarily used for Word files created in older versions of Microsoft Word (Word 97-2003). Microsoft transitioned to the .docx format from Word 2007 onwards, which is based on XML and offers better compression, compatibility, and reduced file size. .doc files can contain rich text formatting, tables, images, and other document elements, making them versatile for professional and personal use. These file extensions are widely supported across platforms, including Microsoft Office, Google Docs, and various third-party applications. Additional Information .pdf The .pdf (Portable Document Format) extension is used for documents that are designed to be shared and viewed consistently across different devices and platforms. It is widely used for electronic documents, including eBooks, forms, and scanned files, as it preserves formatting regardless of the software used to view it. PDF files can include text, images, hyperlinks, and even interactive elements such as fillable forms. Adobe Systems introduced the PDF format in 1993, and it has since become a universally accepted file format for secure and professional document sharing. .xlsx The .xlsx file extension is associated with Microsoft Excel, representing spreadsheet files. It was introduced with Excel 2007 and is based on XML, ensuring better compatibility and smaller file sizes compared to its predecessor, .xls. Excel files with this extension are used for organizing data in tabular formats, performing complex calculations, creating charts, and analyzing data using formulas and functions. .xlsx files are extensively used in business, education, and research for data management and analysis. .pptx The .pptx extension is associated with Microsoft PowerPoint presentations. It was introduced with PowerPoint 2007 as an XML-based format, replacing the older .ppt format. PowerPoint files are used for creating visual presentations that can include text, images, videos, animations, and slide transitions. .pptx files are widely used in educational institutions, corporate environments, and public speaking engagements for delivering engaging presentations. Main Theme: File Extensions File extensions are suffixes at the end of file names that indicate the file format and type. They help operating systems and software identify how to open and interact with the file. Popular extensions include .doc for Word documents, .pdf for portable documents, .xlsx for Excel spreadsheets, and .pptx for PowerPoint presentations. Choosing the correct file format ensures compatibility, data integrity, and ease of sharing."

"The Correct answer is dotx. Key Points A file extension, or filename extension, is a suffix at the end of a computer file.  .doc is a file extension of the Microsoft Word document before Word 2007. .docm is a file extension of a Microsoft Word macro-enabled document. .dotx is a file extension  Microsoft Word template. Additional Information .xls is a file extension of the Microsoft Excel workbook before Excel 2007. .xlsx is a file extension of the Microsoft Excel workbook after Excel 2007. .doc is a file extension of Microsoft Word document before Word 2007. .docx is a file extension of a Microsoft Word document. .ppt is a file extension of Microsoft PowerPoint format before PowerPoint 2007. .pptx is a file extension of Microsoft PowerPoint presentations."