Can you print the report Reports | Print/Consolidate G/L Transactions from Payables? Or is it garbage?

If you can print it, then you may have to end up keying the entries into Ledger manually, and deleting the APALBTCH.xxx file. It depends on how many entries there are and whether you are OK with entering totals (per account) instead of details.

If you can't print it, then it is trashed and there isn't much you can do about it, other than restoring from a backup, unless you know what was supposed to be retrieved, and can key that in manually as Ledger entries. If you don't restore from a backup, then delete the APALBTCH.xxx file.

Softrak offers a data repair service, but for this kind of data corruption it usually isn't worth the money.

Steve