Hmm. Result in Terminal is 'usage: chmod [-fv] [-R [-H | -L | -P]] [-a | +a | =a [# [ n]]] mode|entry file ...' My limited Terminal experience suggests that there's something wrong with the command, which was '~ osimp$ chmod a+x/Users/osimp/Desktop/CGSGetDebugOptions.rtf' (I removed the '.rtf' as instructed).