Hello list, I believe I am looking for a haskell equivalent to a python library function called os.startfile(...) which starts any given file with its associated program. http://docs.python.org/library/os.html#os.startfile says: "...this acts like double-clicking the file in Windows Explorer, or giving the file name as an argument to the start command from the interactive command shell: the file is opened with whatever application (if any) its extension is associated. [...] startfile() returns as soon as the associated application is launched." So to show a readme you just write: import os os.startfile("README.rtf") to show your programs documentation you just write os.startfile("documentation.pdf") and windows will decide which program to use to open a PDF. The must urgent thing I actually want to do is open an Internet Browser with my sponsors URL. Any good ideas? Thanks in advance, Bernhard