#INCLUDE "Win32API.inc"
'[...]
DIM fullpath AS ASCIIZ * 260, appname AS STRING
GetModuleFileNameA 0, fullpath, 260
IF INSTR(fullpath, "\") THEN
    appname = MID$(fullpath, INSTR(-1, fullpath, "\") + 1)
ELSE
    appname = fullpath
END IF