Recover the original baseline

Identify the Delphi 6 update level, DPK/DCP/BPL packages, design-time controls, source paths and compiler directives. Preserve Paradox, dBase, BDE aliases or older database clients alongside the code. Missing component source can constrain compiler migration even when DCUs still build on the original toolchain.

Maintenance decision

Stable build	Document and isolate it before changing packages or database engines.
Build missing	Recover the toolchain and compare output with the deployed binary.
Modern Windows issue	Separate permissions and drivers from compiler compatibility.

Use build recovery, BDE migration, application recovery and the Delphi pillar.