If I didn't already know all of the salaries, I would delete the file immediately. I've seen such files bring a business down to its knees in a gloryous ball of fire.
[*]Person A sees she is jipped and quits.
[*]Person B demands more money even though he isn't a model employee, gets rejected, and creates a horrible office scene for months on end.
[*]Person C demands more money, gets it even though the company can't afford it, and then the compay can't hire Person D to replace person A get the work done. Now everyone is overworked.
Repeat. Suddenly you have 1/3rd fewer employees, 1/3rd of the employees are angry and making everyone miserable, and 1/3rd of the employees are paid too much and are thus overworked in a nasty work environment. The whole company collapses soon.
Been there, done that.
You are paid less because (1) you aren't a good worker, (2) you didn't demand to be paid more, or (3) your company is on the verge of layoffs and can't afford it. You don't need to have a spreadsheet to get paid more. Either (1) become a good worker, (2) demand a raise, or (3) realize you are at a dead end position in which case a spreadsheet won't help.