The following command runs find from a cmd shell: "c:\my editor\editor.exe" -1 "C:\XXX\YY ZZ\AA_CBBB\my_src.cpp" -n143 But it fails when I run it with Run(). The "c:\my editor\editor.exe" part is OK. The problem is with the file name part, which has space in the path. What is the correct way of using the Run() function in this case? (The same call works fine when there are no spaces in the path) /Why Tea