I have a situation where on install a file in my msi may be in use on
upgrades.  I have a custom action that will get rid of any lock on the
file.  however this custom action has to be run as a 64bit process which it
does now.

so I need to run the custom 64bit exe file during install before copying
the files to the destination directory....

1. extract files
2.  run custom action
3. copy files to dest dir

is it possible to run the custom action exe before all the files are copied
to the dest dir?  (i.e. does the msi extract somewhere first where I could
run it?)

or I could have the msi copy files (even if one fails because in use), then
run CA, the copy them again.

any suggestions on how I could do this?

Thanks.
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