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(help) custom boot selection

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so let me explain

 

yes I slimmed down my win7 as much as I could at the expence of any recovery

SO my question would be this

 

how to do this:

 

DVD boots into a DOS/BAT type program where I have 2 selections to choose

 

1. Install Windows

2. Recovery

 

if 1. is selected, the win setup starts

if 2. is selected, it would invoke 7zip cmd line arguments to extract specific folders from install.wim

 

and here lies the problem

- how can CMD environment variables detect what letter is CD/DVD drive and parse it to 7zip cmd line

- how can CMD environment variables detect %SYSTEMDRIVE% and parse it as temp variable to 7zip to extract files to

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i have never done this nor I know how

yet instead using some custom PE, I think this is fastest and easiest, but again I don't have knowledge of that

 

any help ? :P

 


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