folder OR number to folder with api

Hi,

Is it possible to go from a String OR number eg: 671354212 to the folder itself?

Now I search an wtpart that is in a certain folder --> now I can find the folder of this wtpart and than I can look what's in the folder.

It would be easier to have the folder by the OR number. So is it possible to get from the string number to the wtfolder with API?

Thanks in advance