The GetModules command returns a list of modules that are saved inside the given workbook file.  

$\mathrm{with}\left(\mathrm{PackageTools}\right)\:$

$\mathrm{GetModules}\left(''mypack.maple''\right)$

The PackageTools[GetModules] command was introduced in Maple 2017.

For more information on Maple 2017 changes, see Updates in Maple 2017.