Legacy computing system archive files may have unique data structures designed for long-term data retention purposes and not particularly suited for data mining, querying, and other data collection functions needed to prepare certain types of reports. A report specific template may be created to facilitate the extract of specific legacy system data necessary to complete report that is stored in legacy system archive files. Once the data objects containing information relevant to the report have been identified, a hierarchical list of tables and fields of each table associated with each identified data object may be obtained from an external data source for further selection. Copies of the selected table and/or field data may then be extracted, compared, and merged with other data, such as other field and table data, obtained from other sources.