SPECVIEW.INI

Most of the settable parameters (plot colors, special format settings, working folders etc.) are stored in the file SpecView.ini every time the program exits. It is again loaded when the program is restarted. The SpecView.ini file is located in the application data folder. This would typically be

C:\Documents and Settings\username\Application Data\SpectrumViewer
or
C:\Windows\Application Data\SpectrumViewer.

Storing all the settings on exit can sometimes be a disadvantage. For example, if you made a mistake and gave all plots the red color (and forgot to undo it), the program will remember this setting when it is restarted. If you don’t want to re-set all the plot colors manually, you can delete the color lines in the SpecView.ini file, leaving the other lines untouched. Next time the program starts, it will assign its own default colors to the plots, while it still will read the other parameters from the ini file as usual. 

If you delete the SpecView.ini file there’s no problem at all. The program will assign its default values to all parameters when it starts, and it will rewrite the ini file on exit. Editing the ini file while the program is loaded is useless, as the program will overwrite the file again when it exits.