windows - Pass a path with space to a batch file as a parameter

In first.bat, I use

var5=C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\x86_amd64\
CALL scripts\vc64.bat %var5%

And in scripts\vc64.bat, I use

SET var6=%1vcvarsx86_amd64.bat
CALL %var6%

But I get : 'C:\Programvcvarsx86_amd64.bat' is not internal or external command..... error.

If the path assigned to var5 has no space, then it is fine.

I tried several combination of quotations and %1vcvarsx86_amd64.bat, but no change.

How do I make it works with path with spaces?

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To be more precise, suppose it is C:\a b c\

In first.bat: 
     SET var6=C:\a b c\  =====>  '"C:\avcvarsx86_amd64.bat"' is not.....`
     SET var6="C:\a b c\" ====>   There should not be a b
     SET var6=C:\a\ b\ c\ ====>    Can't find the specified path
     SET var6=C:\a b c\ + Using "%var6" ====> There should not be a b

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Update: Here is an example. Change a b to ab works.

call.bat in C:\

@ECHO OFF

SET var5=C:\a b\
CALL C:\1.bat "%var5%"

pause

1.bat in C:\

@ECHO OFF

SET var6=%~1Test.bat
CALL %var6%

RMDIR /S C:\NoWorry

Test.bat in C:\a b Test.bat in C:\ab

@ECHO OFF

RMDIR /S C:\ThereIsNoSuchFolder

Answer

To pass parameters with spaces you need to quote the parameter, then you can remove the quotes using %~1.

So the full script would look like

SET var5=C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\x86_amd64\
CALL scripts\vc64.bat "%var5%"

SET var6=%~1vcvarsx86_amd64.bat
CALL %var6%