A bit of a downloading problem. Two downloading events engendered the response of, “There is no default application specified to open the document.” One document was “VSQL.vmod” for the ability to play by e-mail a former World War II boardgame found at http://www.vassalengine.org/. The other was a verbal example listed in Wikipedia on the pronunciation of a name listed as “Maurits_Cornelis_Escher.ogg” Being new to the game of computing, I assumed the first event was “me Mac vs. the world of PCs. But after the same alert from the second event I became concerned.

Researching the problem on Google led me to “OS X Help” and its article “Understanding File Downloads and Their Remnants.” It covered extensions .dmg, .sit, .sitx, and .zip. It appears to my untutored knowledge that I have encountered a dead end since the extensions .vmod and .ogg were not addressed. Thanks for your consideration.