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There could be several reasons why a package in Modelica might not open after being renamed, including:

1. File path issues: If the package was moved to a new location after being renamed, the file path could have changed. Modelica may be looking for the package in the old file path, causing it to not open.

2. File permissions issues: If the package is stored in a read-only location or if the user does not have the necessary permissions to access the file, it may not open.

3. Typo in the package name: Even a small typo in the package name can prevent it from opening in Modelica.

4. Missing or incorrect import statements: If the package has dependencies on other packages and the import statements are missing or incorrect, it may not open.

5. Conflicts with existing packages: If the renamed package has the same name as an existing package, it can cause conflicts and prevent the package from opening.

To resolve the issue, the user can try relocating the package to the correct file path, checking the file permissions, ensuring the correct import statements are included, ensuring there are no spelling errors in the package name, and renaming the package to a unique name.