AnyDAC Explorer and AnyDAC Administrator- both have the BDE aliases migration function. Run one of the applications and choose Connection -> Import BDE Aliases: 

This dialog shows all your BDE aliases. Select the ones you like to migrate to the AnyDAC. Click Overwrite existing connection definitions.... The existing AnyDAC alias definitions with the same name as BDE aliases will be overwritten. In case you do not like to overwrite existing aliases you will get duplicates with names like "DBDEMOS_1". After pressing OK, AnyDAC imports all BDE RDBMS's aliases supported by AnyDAC. 

AnyDAC imports a new connection definition for every existing BDE alias in AnyDAC. They will be placed into the connection definitions file.