I am using the UNCTAD data which is supplied in *.ivt (Beyond 20/20 format) file. I don't know how to import that format into R. There is a special software to read this file it is known as Professional Browser is available here.
A sample of the file is given here.
I use this browser and then copy paste the data. It has restrictions on number of rows to be copied. Hence, it is very tiring process. If it can be imported then it would give a huge boost to study UNCTAD data.