Convert SLK to PPM

An SLK file, standing for Symbolic Link File, is a specialized file type used primarily in spreadsheet applications to facilitate data exchange. Originally introduced by Microsoft for its Multiplan spreadsheet program in the 1980s, the SLK format was later adopted by other spreadsheet software due to its simplicity and efficiency. These files are composed of ASCII text and include symbolic references to cells, allowing for easy parsing and manipulation of spreadsheet data. The primary use of SLK files is to enable seamless data transfer between different spreadsheet programs, ensuring compatibility and preserving the integrity of the data during exchange.

The Portable Pixmap (PPM) file extension, an image format within the Netpbm family, stores simple, uncompressed images. Introduced in the late 1980s, PPM supports RGB color and grayscale images, making it suitable for basic image processing and conversion tasks. Its plain text encoding simplifies debugging and data manipulation, although its lack of compression results in larger file sizes compared to modern formats. As such, PPM finds limited use in contemporary applications, mainly in educational and experimental settings where ease of implementation and readability are prioritized.