IIS classic ASP credentials to pull shares from file share?

Trying to move an IIS classic ASP site to a new server.  One thing i'm struggling with is although the site works correctly, on the old server there's a page that allows the user to open several documents (from a file server, using a UNC path it appears) but I can't figure out what credentials it's using, as on the new server I get an access denied.

How would I view what or where the credentials are stored to retrieve the files?  Would it be hidden in an ASP file somewhere or is it somewhere on the server configuration? (on the APP pool?  Was thinking classic ASP didn't use app pools though?)

Open to ideas
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Big MontyWeb Ninja at largeCommented:
whatever user is set to run your site (usually IUSR_MachineName) needs to have access to where the files are being read from. This user info can be found in the general security section of IIS for your site.

all sites have an app pool that run on IIS, including classic asp sites

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