Build 5.0.0.61 of xlsgen is a performance fix for working with creating large pivot tables. Another o(n2) algorithm gets removed.

Build 5.0.0.60 of xlsgen is a security update. It updates libpng internally used (library for processing PNG pictures), taking it to the latest 1.6.53 (as of date), thereby fixing 5 vulnerabilities (2 moderate and 3 high).

Build 5.0.0.59 of xlsgen fixes a problem in the API related to searching stuff in Excel files. The results were incorporating non-matches. Now no more.