iDB Patches
iDB.delta you need to patch iDB.tar.
iDB.xdelta you need to patch iDB.tar.

iDB-Host Patches
iDB-Host.delta you need to patch iDB-Host.tar.
iDB-Host.xdelta you need to patch iDB-Host.tar.

iDBEH-Mod Patches
iDBEH-Mod.delta you need to patch iDBEH-Mod.tar.
iDBEH-Mod.xdelta you need to patch iDBEH-Mod.tar.

Get xdelta
You need xdelta(Windows) xdelta3(unix) to patch .xdelta files.
You need xdelta(unix) to patch .delta files.