Extract text from XML4King configuration files (X4K)
To convert X4K configuration files to another format, you need XML4King or other Settings software.
To convert other file formats to the "Mapping Configuration File" file type, you need software like XML4King or a similar tool.
The .X4K format is an XML4King Configuration File developed by Optimal Performance. It is used exclusively by XML4King, a data conversion tool that operates within Microsoft Excel. The file's primary function is to store mapping rules that translate columns from an Excel spreadsheet or CSV file into specific XML fields required by King Business Software, a Dutch accounting and ERP platform.
One of the major disadvantages of the .X4K format is its hyper-specific, proprietary nature. It does not contain actual financial or business data. Instead, it only holds the structural blueprints for how that data should be exported. Users often confuse it for a standard spreadsheet or a finished data file, leading to frustration when it cannot be opened in standard viewers. The format is virtually useless without an active installation of XML4King and Excel.
If you need to extract the mapping logic, the best conversion targets are generic text formats like TXT or XML. Converting an .X4K file to these formats allows developers to inspect the field definitions without needing the original add-in. However, you cannot convert this file into a XLSX spreadsheet containing user data, as the file only stores the export rules.
Standard online converters fail to process this file format because it relies on a closed, niche mapping schema rather than standard document data. Often, only the original XML4King software can properly read or execute the mapping data.
Convert.Guru analyzes your X4K file, detects the exact format, and lets you read the text inside.
If you want to convert X4K file to , you can use XML4King or similar software from the "Data Mapping Settings" category. In the File menu, look for Save As… or Export….
To convert files to X4K, try XML4King or another comparable tool in the "Data Mapping Settings" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our X4K converter.