6
The logic/functionality of your block is stored in .php files, which should be located at
XOOPS_ROOT/modules/YOUR_BLOCK_MOD/blocks/block_logicOfYourBlockMod.php
The files related to the presentation (output presented to users/viewers), are your template files, which are .html files, and should be stored at
XOOPS_ROOT/modules/YOUR_BLOCK_MOD/templates/blocks/block_templateOfYourBlockMod.html
Though, not sure I understood your question completely, so I do hope this is what you had been inquiering about....