DigitalVolcano Software Support

You can turn off bak files in the Options screen:
http://www.digitalvolcano.co.uk/textcra ... =&sct=MzA4

You could try factory-resetting the program by deleting the database at
C:\Users\[YOUR USER]\AppData\Roaming\DigitalVolcano\DuplicateCleaner\DuplicateCleanerPro.data

Which folder did you move? Duplicate Cleaner will still try and write the database to the same place (C:\Users\[YOUR USER]\AppData\Roaming\DigitalVolcano\DuplicateCleaner on Windows 7)

(\n|$) maybe? That will match end of line or end of file.

Sounds like it's having trouble writing to the database. Do you have enough disk space left, or is there a space quota on your user area that is being reached?

You can export a CSV file which you can load straight into Excel

File->Export duplicate files list to CSV...

Does your file not have CR/LF line endings? That could cause no matches with that expression. You can swap the \r\n for $ to indicate any line ending - then it will work on all files.
Also make sure that 'Multi line anchors' is checked.

You could use the 'select by text pattern' function on the file column http://www.duplicatecleaner.com/manual/select_by_text_pattern_window.htm?ms=AA==&mw=MjQw&st=MA==&sct=OTI= You could select using 0000 - this will mark all the files starting with 0000. Alternately if they start with o...

This works (lower case r):
You need the 'multi line anchors' option checked as well.

If you are having memory trouble you could try running in Line by line mode, provided you are not using multi-line find/replace operations.