This program is basically a utility created to edit your D64 files.  Hopefully when it is done it will have all of the features you’d expect from a c64 based disk editor, as well as additional features that make it easier to manage your D64 files.

Here some features:

• Read D64 files, display the directory, move files around the directory, rename files.
• Export files from the D64 into PRG files.
• Import files into the D64 with autodetection for P00 files.
• View/Edit the BAM.
• View the block chain of files on the D64.
• Create new blank D64 files, clean existing D64′s.
• View and modify blocks on the disk in hex.
• Automatic check for crosslinked files on the D64.
• View the directory using the native c64 font.
• SEQ File Viewer using the c64 font with PETASCII->ASCII conversion option.
• Drag and Drop functionality. Drag D64′s onto the main screen to load them, drag other files to import them.
• Preliminary support for importing T64′s.
• A filename builder to enable easy use of the C64 Characterset in filenames.

Changelog:

• Fixed bug where Save button would still be greyed out if you answered “NO” to removing the windows filesystem read-only flag from a file.
• Fixed bug in function used to write the directory. It was mistakenly allocating Block 19/0 along with failing to write out a 49th directory entry if 19/0 was not already allocated prior to choosing to save the D64 file.
• Fixed bug in D64 Creation routine. Even if you didn’t select the disk to be a C128 Autoboot, Block 1/0 was being allocated even if empty.
• Fixed drag & drop to work reliably. Ripped out a bunch of old code and added new.
• Fixed bug in SEQ Viewer function where the program would crash with an “Out of Memory” error on pretty much any file type other than SEQ files.
• Expanded window size for separators list.

source: d64editor.com