In VO most programmers used libraries and not DLLs. So, when executing any of these functions, they are called directly from the executable, and therefore this code works in VO:

function GetExeFileName() as string
local pszBuffer as psz
local cName as string

pszBuffer := MemAlloc( 1024 )
GetModuleFileName( _GetInst(), pszBuffer, 1023 )
cName := PSZ2String( pszBuffer )
MemFree( pszBuffer )

return cName

But in X# libraries are DLLs and therefore external entities. This call can be changed to

function GetExeFileName() as string
local cName as string
cName := System.Reflection.Assembly.GetEntryAssembly():Location
return cName