I have been using Allway Sync for many years successfully until this week when 3-Word Docs were wiped on both my hard drive and the external drive.
I managed to recover one but not the other two. I've downloaded Recuva but the files name don't seem to match up with my wiped files.
That will happen to whatever file that gets recovered. I was recovering some flip video files and the file name changed from VID to _ID
Not quite. In FAT file systems a deleted file is identified by the first byte of the file name being altered to 0xE5. This isn't an underscore, but it isn't a character allowed in file naming, so is shown as an underscore.
In NTFS file names are changed (in a totally different way) when a file is sent to the recycler. Unfortunately the OP hasn't given any information to show what the problem really is.