getpwuid and getgrgid are unimplemented by ActivePerl for Windows. Instead I used Win32::LoginName and I see my personal user ID. This agrees with several variables found in %ENV such as
AUTH_USER
LOGON_USER
REMOTE_USER
except those variables also include the domain name ("DOMAIN\userid").
The USERNAME environment variable is showing as the server name ("MYSERVER$") and I think perhaps this is a remnant of the IIS process before it invoked the CGI module and impersonated the remote user making the request.

Maybe there's something else in a Win32 module that I can use to diagnose the situation. For example, I'll use Win32::File to check whether the folder has the readonly attribute set.

In reply to Re^2: permission denied on file write only when running browser on application server by Anonymous Monk
in thread permission denied on file write only when running browser on application server by raccardi

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