runghc -fglasgow-exts issues

I need to pass -fglasgow-exts to runghc. It appears that if the first flag to runghc is -f, it treats it as a path to GHC itself. So, I cannot do the following:

runghc -fglasgow-exts Test.hs

because runghc failes (it says it can't find glasgow-exts). However if I do this:

runghc -fc:/ghc/bin/ghc.exe -fglasgow-exts Test.hs

it works. Is this the expected behavior? I really don't want to pass full path to GHC in order to simply specify -fglasgow-exts. I could fool runghc by doing this:

runghc -v -fc:/ghc/bin/ghc.exe -fglasgow-exts Test.hs

and it'll work since the first argument isn't -f, but I really don't want to do this (if I have to, what's a good argument that does nothing?). Thanks, - Slava.