Sorry, but this is really cheezy design.
If you must have extra files to keep track of data... why not keep all of the extraneous files in their own 'Assets' folder within the main Project folder... rather than continue to clutter up the main Project folder? It wouldn't bother me in the least to have one extra folder for storing these files within the main Project folder. However, stuffing the main Project folder, especially if you intend to come up with even more junk files to keep track of... is ugly.
And I agree with the first poster... makes it ugly to keep track of your Project files. I save projects continually as I'm working with new suffixes. I may save 100 Project files for a single Project in 1 day. Then to add, on top of that... your 100 extra Gobbler files (which is ridiculous, because I'm not EVER going to use it)... is, not only ugly, but irritating. Especially when all it would take is to store those files in their own sub folder.
Really... the only beef I have with X3. Otherwise, it's great! Who could've ever imagined you'd start automatically stuffing the Project folder with files I have absolutely no need for (at this point... unless you, indeed, start adding something actually useful to them later on). Just give them their own "Assets" sub-folder.
Luckily... I use Directory Opus, which allows me to easily save the fact that I no longer want to view files in Sonar Project folders that have a file extension of '.cwp.assets', so I don't have to look at 'em at all, and it's an immediate fix. Otherwise, this would be extremely irritating.
Can't believe there aren't more complaints about this.