sliver, do you wanna see for the MSI file if it's installed?
or if the product is installed?
Code:

$=createobject("windowsinstaller.installer")
$bk="HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\"
for each $product in $.products
"MSI key: " $product ?
"Soft name: " readvalue($bk+$product,"displayname") ?
?
next

get $



hmm...
I think I'm getting closer to what you got there in my mind.
you gonna have huge bunch of self made msi-packages and you would like to have suits-you-sir-suits-you-all-method to check each one, right?
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