Quest 5
Quest 5, commonly just called Quest, is an authoring system published in 2012 for Interactive Fiction. It creates XML files with the extension .aslx, which can be edited either in an official, GUI-based editor (written in a combination of C# and Visual Basic. NET), or as plaintext. The editor contains a feature to "publish" these as .quest files, which are ZIP files containing the original .aslx as well as supplemental files. The .aslx or the .quest files can be played either in the editor or in a "web player" (which uses the same backend as the editor).
Quest 5 should be confused with neither Quest versions 1-4, which it superseded but is incompatible with (although the Quest 5 editor contains a feature to play them), nor QuestMaker, which is entirely unrelated aside from being another interactive fiction format.
Identification
The first line of a .aslx file will look like "<!--Saved by Quest 5.5.5433.25066-->" (minor version numbers varying), unless it has been created by hand. In either case, the root node of the tree (the next line, if automatically generated) will look like "<asl version="580">" (for Quest 5.8.x). It is unclear whether the 5 will be incremented to 6, what will happen once the minor version exceeds 9, etc., so it is probably best to identify by the version-independent parts of these, as Quest versions 1-4 use a completely different format.
