ExecFile() not executing a file

Has anybody experienced ExecFile() not executing a file when the pathname to the file in question appears to be spot on ? The executable in question runs successfully when the icon is double clicked ?

maybe it is some kind of dos-type app? then you should either use ExecFile "cmd " + filename$ (xp) or
ExecFile "command " + filename$ (98)

It is a BB3d.exe . I have successfully executed the file form within my BB app prior to 'installing' my project. I have tried using the following to determine whether the confirmation that I am accessing the correct path within the application is not lieing to me:-

checkthere = FileType (filename$)
Text 5, 600, "The filetype is:- ", checkthere

checkthere is basically populated with a blank space character ? I would have thought it should be 0, 1 or 2 - I'm probably going syntactically wrong somewhere....

Ended up using a workaround:

prefilename$ = SystemProperty("AppDir")
filename$ = SystemProperty("AppDir") + "Results_Compare.exe"
;filename$ = resultzname$ WORKS
ChangeDir prefilename$
ExecFile "Results_Compare.exe"

Could be the file cannot be found. Try
print filetype(filename$)
or
if filetype(filename$) = 1 then print "file exists"

Should be Text 5,600,"The filetype is:- "+checkthere

Thanks Tom, them syntax gremlins....

Blitzplotter:
"don't eat yellow snow"
Don't??? Hmm, maybe that's why my winter snowcones have been tasting rather off lately. :)