> will handle various edge cases I might not think of.

There is an extremely stable approach I used on linux to "import" the ENV from a child process.

see code samples in Re^3: How to "source" a shell file in Perl? (Trojan Dump)

You might be able to adapt it for win/batch.

• Your top-level Perl script basically calls a child-batch on second level which creates the environment variables.°
• The batch itself calls another Perl one-liner on third-level which dumps/serializes* %ENV to STDOUT.
• The top-level script reads from STDIN and evals the data

No parsing whatsoever needed, just nested calls using standard mechanisms and modules.

HTH! :)

update

*) using Data::Dumper ,which is in core

°) by reading your INI or whatever your process is requiring

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