I'm getting the above message, and files are not deleted by DC, even though the marked file(s) can be deleted by other utilities.
Despite this - I like very much this utility and would like to use it as my default one - once I'll be able to delete the files.
Here's a directory listing, showing that the file and its directory is not hidden/system/read-only.
C:\0_bin>dir *.* /s /ah
Volume in drive C is WD160_2007
Volume Serial Number is A4FB-225C
Directory of C:\0_bin
02/11/2005 11:22 AM 8,628 windiff.GID
1 File(s) 8,628 bytes
Total Files Listed:
1 File(s) 8,628 bytes
0 Dir(s) 14,994,669,568 bytes free
C:\0_bin>dir *.* /s /as
Volume in drive C is WD160_2007
Volume Serial Number is A4FB-225C
File Not Found
C:\0_bin>dir vbrun*.* /s
Volume in drive C is WD160_2007
Volume Serial Number is A4FB-225C
Directory of C:\0_bin
05/12/1993 12:00 AM 398,416 VBRUN300.DLL
1 File(s) 398,416 bytes
Directory of C:\0_bin\archive1
05/12/1993 12:00 AM 398,416 VBRUN300.DLL
1 File(s) 398,416 bytes
Total Files Listed:
2 File(s) 796,832 bytes
0 Dir(s) 14,994,669,568 bytes free
C:\0_bin>cd ..
C:\>attrib 0_bin
C:\0_bin
C:\