The file extension SLK identifies a file that exists in the symbolic link format. This file format was developed by Microsoft to transfer data between spreadsheets and other database applications.
The files contain text that uses semicolons to separate the contents of a cell by column, line, format, and content. These data are stored in ANSI format.
Complex formulas are stored in SYLK codes.
Occasionally the endings silk or syk are used for these files.
Although Microsoft did not release the specifications of SYLK, several variants of the format are supported by a number of applications.