Separating Columns in Excel Export from R

Hello - 

When I export my files using the write.table command and name the file.xls
and use the sep="/t" to try and separate the columns in excel, everything
just stays in one column. how do i get them all into separate columns (it
did this before but i can't figure out what's different between this time
exporting and other times when i enter the same thing)

example:

write.table(topTable(fit2, coef=3, adjust="fdr",
sort.by="B",number=50000), file="preterm_parturient.xlsx", row.names=F,
sep="/t")

what about this command wont let the columns get separated? 



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