1. Unzip Firebird-xxxxxxx-xxxxx.zip
3. Execute fbserver with "-a" switch.
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Example for windows:
Start cmd.exe and type:
cd Path_to_firebird\bin [enter]
fbserver.exe -a [enter]
(Use Flamerobin's "Register existing database..." option to connect to a .fdb file,
and then edit and view the contest of the same.
For username | password combo try: sysdba | masterkey)