The 100005 internal error is usually fatal; it is a report that the metadata has been corrupted. This is most likely related to a file system/media failure.

You can attempt to unload the data using the ulunload utility (or dbisql) but if that also reports the same error your database is unusable; and will need to replace the database and recreate any missing data.

To help avoid any future occurrences, you should run with a newer build of 12.0.1 to avoid the issue addressed by engineering change#693111: - "Files were not always properly flushed to the storage medium on CE."

That fix was checked into the 12.0.1#3578 build and has the description

      "On Windows Mobile / CE, database files were not always properly
       flushed when necessary. The file metadata was the most likely data
       not to be flushed and assertion failure 201129 (File shorter than
       expected) is the most likely corruption to be seen in the event of
       a full power outage (eg. if the CE device battery runs out). 
       This problem has been fixed."