Supporting Windows Question

sourcelist registry entries

10/28/2015 4100 views
what does "1" and "n" means inLastUsedSource data of sourcelist registry key?
for ex.
LastUsedSource         REG_EXPAND_SZ     n;1;C:\Users\asd\AppData\Local\Temp\46A940C5-3A43-447F-A360-F2224D1364ED\
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various links that will help...

Answered 10/28/2015 by: Pressanykey
Red Belt

  • Thanks for your reply..!!
    got the meaning of "n"...for what does "1" mean w.r.t. searchorder?
I wouldn't waste too much time with it. The sole purpose of the 'LastUsedSource' entry is to populate the drop-down that appears when self-healing/repair can't find a source for the original media. If that entry's blank, Windows Installer will carry on but simply display an unpopulated drop-down.
Answered 10/28/2015 by: VBScab
Red Belt

@Press, you know you can insert actual links in posts? Click the 'chain' icon on the bottom row of the toolbar. To convert existing text, highlight it, then click the icon.
Answered 10/28/2015 by: VBScab
Red Belt

  • Hi VBScab, no I didn't... next time (maybe) ;-)

n = Network location

Usually you can provide multiple locations for installer to look into the source. If one fails, installer will look into other location for source resiliency.

Example: We have source at two locations D:\Package and \server\packages$\

When we add the SourceList, it makes entries in the below registry with numbers.Multiple registry entries are denoted by numbers.

HKEY_CLASSES_ROOT\Installer\Products\guid\SourceList\Net\1 (REG_EXPAND_SZ) = D:\Package\
HKEY_CLASSES_ROOT\Installer\Products\guid\SourceList\Net\2 (REG_EXPAND_SZ) = \server\packages$\

So when the Installer has used from D:\Package which holds the 1st position in Net location, it has made entry in the below registry with LastUsedSource as n;1;D:\Package\ 

HKEY_CLASSES_ROOT\Installer\Products\3048EFD73C3DEA749B250BB825C98E58\SourceList\LastUsedSource (REG_EXPAND_SZ) = n;1;D:\Package\

Link: https://support.microsoft.com/en-us/kb/905796

Hope this helps.

Answered 10/28/2015 by: apptopack
Red Belt

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