Because file extensions are chosen based upon the preferences of a program's developers when the software is designed, it is possible for two completely unrelated files to share a common file extension. This is the case with .tab files.
A file with the .tab file extension is known either as a Guitar Tablature File or a Tab Separated Data File.
Guitar tablature files contain the lyrics to a song with the corresponding guitar chords written above the words. A tab separated data file is a document similar to a spreadsheet but created in a basic text editor rather than a program with pre-set columns and rows.
Both types of .tab files can be created and edited with basic text editor programs like Notepad, TextEdit or Power Pad.
Tab separated data files use the "Tab" key to signify the location of rows and columns, allowing them to be imported into a spreadsheet program like Excel.
Because both types of .tab files are created with text editors, shared files can be accessed on practically any type of computer, regardless of the type of text editor and operating system on the other party's computer.
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