You have W10 on that pc too, right ? if so maybe part of the W10 files integrate with your W7, causing the change of your icons. Maybe what I should be asking is whether your W10 .db files have always had the cube for it's db files or if those files were also represented by the gear icon ?
Also do you have a new program on your pc that is associated with opening db files. Icons will change when you associate a different program with it.
Isn't there a registry program that uses the yellow cube for it's icon, if I remember right I used to have a registry program on my old W7 pc that used that icon.
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