Actually small corretion was made for version 1.2 and it is now version 1.2.1 downloadable from the same location:
http://www.opentask.com/downloads/Dump2Wave.zip
Revised "What's new and corrections" list:
1. Dumps with file size not divisible by the product of bytes-per-sample and channels (sample alignment) are converted into correct wave files now
2. Sample alignment is calculated correctly for non-CD quality wave
3. File paths with spaces are allowed now (you need to include them in double quotes)
4. Added diagnostic and error messages
Thanks to everyone giving it a try
Dmitry