--to get ONE "\" in the end you need to write "\\"
TheFirstString = "c:\\temp"
TheSecondString = "myFile.max"

--Add them together

newString = ( TheFirstString + TheSecondString )

--result: newString = "c:\tempmyFile.max"
--NOT a VERY good filePath...
--remember to add the \\ when needed..

newString = ( TheFirstString + "\\" + TheSecondString )
--result: newString = "c:\temp\myFile.max"

MyPath = "c:\\dir1\\dir2\\dir3\\test_Diffuse.png"
MyPathArray = filterstring MyPath "\\"

for s in MyPathArray do ( print s )

--Get the name of the Last Folder
MyPathArray[4]

-- This always takes the Last dir
-- Even if it is a long path
MyPathArray[MyPathArray.count - 1]
 

--gets all files in a folder
TheFiles = getfiles "c:\\temp\\*"
for f in TheFiles do (print f )

--gets all png files in a folder
TheFiles = getfiles "c:\\temp\\*.png"
for f in TheFiles do (print f )

--To reset max from maxscript is very useful when
--Batching alot of files, #noPrompts forces max to 
--Just reset without warnings...
resetMaxFile #noPrompt


--if you want to load a maxfile from disk
loadMaxFile "c:\\temp\\myFile.max"

--if you want to merge.. there is many options that you can use
--the #select option selects the merged objects so that you can
--store the selection in a variable
mergeMaxfile "c:\\temp\\myFile.max" #select
StoreSelection = selection as array --store the merged objects

--for example if you know the name of some objects in the scene
--you merge from you can add an array and only merge them
mergeMaxfile "c:\\temp\\myFile.max" #("box01","box02","box03") #select