All about XLK Files

The XLK file type is primarily associated with Excel.

XLK	File extension: XLK
	File type:	excel backup file

What is an XLK file?

XLK files mostly belong to Excel by Microsoft Corporation. XLK file stores backup copy of a Microsoft Excel spreadsheet file. XLK file is a backup of the old version of the XLS file. User can recover corrupted or deleted XLS files with the help of XLK files. User can open XLK files in older version of Microsoft Excel.

How to open XLK files

You need a suitable software like Excel to open an XLK file. You need a suitable software like Excel from Microsoft Corporation to open an XLK file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your XLK file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a XLK file directly in the browser:. Just drag the file onto this browser window and drop it.

Online XLK File Viewer

Choose your .xlk file to view

or drag and drop it here

Online File Viewer

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How to extract texts from XLK files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

1. Just click the "Choose your .xlk file to view" button on this page.
2. After your file is opened in browser,
3. click "Save as..." in the menu.
4. Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
5. Your file will be converted and downloaded.

What to Do When a .XLK File Fails to Open

Because .XLK files can be generated by different programs, they aren't universally openable with a single app.

1. Identify the Source: These files are typically created by office workers saving spreadsheet backups, strongly suggesting a Microsoft Office workflow.
2. Check the Header: Open the file in a hex editor to inspect its first bytes:
   • D0 CF 11 E0: Indicates a legacy Microsoft Office document.
   • PK: Suggests a zipped XML format, like a modern Excel backup.
   • Plain text: May indicate a CSV or XML-based backup.
3. Use the Original Software: You will usually need the original program, such as Microsoft Excel, LibreOffice Calc, or Apple Numbers. If unsure, ask the sender.
4. Use this Webpage: Drag and drop your .XLK file into our viewer above to automatically detect its format, extract metadata, and preview its contents.

XLK file format:

The file format, which is the arrangement and type of data in a file, determines which program can open the file. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. So a detailed analysis of a file is vital in order to determine the format and the associated program. Below you will find our evaluation of the XLK files:

The XLK file extension is used by different programs with different formats. The two most popular formats are as follows:

• 45% of all XLK files use the ZIP algorithm, so multiple files are compressed and stored together in one XLK file. XLK files contain from 12 to 140 compressed files. File names inside are [Content_Types].xml, \_rels\.rels, \docProps\app.xml, \docProps\core.xml, \xl\_rels\workbook.xml.rels, \xl\calcChain.xml, \xl\comments1.xml, \xl\drawings\drawing1.xml, \xl\sharedStrings.xml, \xl\styles.xml, \xl\theme\theme1.xml and \xl\workbook.xml. If you want to see the included files and images, simply rename the file extension to .zip and double-click it. The file size is in the range of 17 KB to 4 MB. The files contain the following words: [Content_Types].xml. These files can be linked to seguridad, backup, sauvegarde, sicherungskopie, list, software, zapasowa, deluxe, kopia, mking and gold.
• 45% of all XLK files use the Microsoft Compound File format, which is also called Compound File Binary File format (CFBF or CFB) or OLE2 Compound Document format. Compound document files work similarly to real file systems. They contain a number of independent data streams (like files in a file system) which are organized in a hierarchy of containers (like sub-directories in a file system). Compound files always start with the bytes ÐÏࡱá (hex code D0 CF 11 E0 A1 B1 1A E1). The app name of XLK files is Microsoft Excel, PlanMaker, Rev. 982 or WPS Spreadsheets. The globally unique identifier of this file type is 00020820-0000-0000-c000-000000000046 or 00020810-0000-0000-c000-000000000046. The internal containers are called Workbook, SummaryInformation and DocumentSummaryInformation. The average file size is 250 KB with most files being between 34 KB and 2 MB in size. Files like these are sometimes connected to backupof and passwords.

The remaining 10% of all XLK files are files with no common format. They are often associated with yedek, control, resumen, detail, order, plan or xlsx. Drag & drop your file here to see the file format and a preview of your XLK file!