$Ntuninstall in XP - Some questions

Question about $Ntuninstall files..

So I was nosing around an old HDD that had XP installed , and I come across these folders in the WINDOWS directory. Inside them, there are files called “spuninst”.

So I open them in notepad and there is a “system.snapshot” heading with a bunch of programs and such listed.

My first question is- Is this every program that was installed at this particular moment in time on the computer? Is there way to see when past programs were installed and subsequently deleted if there are no files to look at creation dates?

Thanks for any help