Is it somehow possible to add files by double click? Something like "enqueue as default" in Winamp and play these files as enqueued?

Thank you

Open an explorer window (my computer for exemple) go to Utils >> folder options >> file types >> then find the formats opened by foobar (mp3, mp+, it, mod, ogg etc.) Click on the "advanced" button, in the actions list select "enqueue" and click on the "by default" button.

PS : I use a french version of windows, and I just guessed what the options could be named in the english version, so it might be a little different.

Thanks for your answer but I guess you are using Win 2000. As I am using 98, there is no "enqueue by default". But I tested some add-ons to my foobar directory and it's ok now. This is how it looks like:
C:\WINDOWS\Desktop\fb2k_win9x\foobar2000.exe "%1"

It's at least something although it doesn't play them automatically

Oh, ok. Sorry, I thought you could do that with 98 too. Hopefully someone will find a better solution or it will be added in a future release.