Breaking: #96518 - ext_typoscript_*.txt files not included anymore

See Issue #96518

Description

In previous TYPO3 versions, files named ext_typoscript_setup.txt and ext_typoscript_constants.txt which could be placed into an extensions’ root folder, were automatically included for all TypoScript evaluations.

This functionality stopped working, as the file ending .typoscript has been unified since TYPO3 v8.

Impact

Contents of these files are not evaluated for TypoScript anymore.

Affected Installations

TYPO3 installations with custom extensions including such files.

Migration

Rename the files to ext_typoscript_setup.typoscript and ext_typoscript_constants.typoscript which ensures compatibility with all supported TYPO3 versions.

The file extension .typoscript was used since TYPO3 v8 and both versions (.txt and .typoscript) have been working side-by-side since TYPO3 v8.