w51 to ast conversion pretty much describes the process of making new Corel WordPerfect templates (.ast) based on older documents, for example version 5.1 .w51 files. In theory this should be possible, although you might require a specific version of Corel WordPerfect for that. Might be worth making a new template from scratch and just using elements of the documents if simple resaving fails.
Updated: August 23, 2023