This question was solved by @Amol but I re-write it here in order to find it without problems
viewtopic.php?p=127685#p127685
@BarryK , if u consider it unnecesary, please delete this post, thanks.
Have a nice day u all.
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Right click any desktop icon
Rox-filer
Options
Pinboard .... and modify the font and size as u want.
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