Put the path in double quotes wherever there is a space in the path.
In this case,
c:\Program files\rainforestNET\crexport> crexport -FC: \Work
order1.rpt -OC:\test.pdf -EPDF -XFile
Should be:
"C:\Program files\rainforestNET\crexport\crexport" -F"C:\Work
order1.rpt" -OC:\test.pdf -EPDF -XFile
Try that.