Now that CP/M is handled (-> previous page), here a suitable tool for DOSINTERLEAVE / DE-INTERLEAVE RAINBOW-100 DISKS
A VB.NET 2010 Express Project (console application). VB source provided. Replacement for PUTR, which is not up to the task (as it damages tracks 0 and 1).
Works only with bootable DEC Rainbow _DOS_ images (*.img; 80 x 10 sectors; 409.600 Bytes).https://dl.dropboxusercontent.com/u/37819653/skew_unskew.7z
FURTHER REFERENCE: 'A Skewed View of Disk Geometry' http://jeff.rainbow-100.com/?p=43
Recommended to OPEN and EDIT * unskewed * disks http://hp.vector.co.jp/authors/VA013937/editdisk/index_e.html
A second invocation of the skew tool automagically skews the disk again (and removes the BPB) so everything is back to normal.
Profile selection: (Manual FD)
[Search] -> [Search] -> "IPL Device found" ( FAT12 and all other values are populated now, thanks to the patched BPB )
[OK] and you are done.
The reason why this tool handles only DOS is that there are many 409.600 byte images floating around (P/OS, VT180, DEC Pro) and i didn't want to break them.