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It depends on what version. 97-2003 use .doc I don't know any others
Normally xls is the extension for an Excel spreadsheet document.
The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.
For a standard Excel document, prior to Excel 2007, it is xls and xlsx is used in 2007. There are other kinds of files created by Excel, like templates which can be xlt or macros which can be xlm and xla for Add-ins, and there are other extenions. For 2007, you add x to the end of them.
.ppt for versions up to 2003 and .pptx from version 2007 onwards.
The operating system does not determine the extension of documents. The version of the application determines that. Versions of Word since Word 2007 use the .docx extension. As Windows 8 came out after that and many people are using versions of Word from version 2007 onwards, a lot of Windows 8 machines will have .docx extension files on them, but they can also store files with .doc extensions just as easily.
The .tmp extension is a TEMPORARY file.Often these files are created during the installation process or during cleanup procedures.Sometimes by changing the extension you can open them in some program or other.If they are old they can safely be removed.
An Excel Book or Excel Workbook with the files extension of .xlsx
Both are Microsoft Word document files. ".docx" is the new file extension that newer Microsoft Word version uses while the older versions save word files as ".doc" files.
.PTX is the extension for files created by E-Transcript. You can download the viewer of these files at http:/www.reallegal.com/softwareDownloadETranscriptViewer.aspIt is also used by Pentax cameras, but the most unusual and difficult to find is the one I gave.
.ppt is the file extension for power point files
The files which store the copy of your original data are called backup files. In windows backup files are created by NTbackup utility and windows backup and restore utilities. These backup files have .bkf file extension.