It depends on how you use it. "Accessoarer", borrowed from french, is mainly used in fashion, clothes and such. "Tillbehör" is used when talking about cars, computers and such. "Bisak" can be used in most cases but will be considered formal.
In my Swedish WindowsXP system it is: C:\Program\Windows NT\Tillbehör\WORDPAD.EXE "Tillbehör" is Swedish for "Accessories"
And is "och" in swedish.
På svenska
"King" in Swedish is "kung".
Equality is "jämlikhet" in Swedish.
School is skola in Swedish.
Adventures is äventyr in Swedish.
29 is tjugonio in Swedish.
Small is liten in Swedish.
Vacation is lov in Swedish.
Celebrate is fira in Swedish.
Faster is snabbare in Swedish.