Jo Ann,
I believe what WT does during the integration call is simply "assign" a generic name - "sketch.ax2" in this case (?) - rather than name the sketch the same as the report file, which would be more proper IMHO. So, essentially, your last sketch "file" while IN apex (in memory) and our auto-backup file (on disk)) gets overwritten over and ove. If the integration call is succesful, the forms program may store the file in some other place (the root of your question?) per their own settings. There is a setting in Apex which lets you control where you'd like your sketches and other things to be by default, but I believe WT's use of our integration code overrides that so that they can control where the files are. This is a normal "housekeeping" thing...
The backup sketch file (sketch.axb) is temporary and is intended as protection against power outages, system crashes, etc. Apex saves and then updates a temporary AXB file as per your settings ("Event" or "Area" - each time you draw a line, or each time an Area is closed.) This setting is in the Configuration dialog - Misc. tab.
The AXB file exists only for use while you are in Apex, and it is deleted upon successful exiting of Apex. So, unless your system crashed while you were in Apex, the AXB file should no longer be there and you'll have to look for the "sketch.ax2" or whatever it is named. If Apex did not exit properly, the next time you run it, a dialog should come up, asking if you want to load the AXB file. If you had multiple files open, it would lave a list of files to choose from.
I suggest running Apex in Stand-alone mode first, rather than via integration, just to see if anything shows up. If nothing shows up, the original "sketch.ax?" was saved wherever the integration call told it to, or per your Configuration settings.
Another trick for the future is to use a "Save as" occasionally. I believe WT disables this but there is a work-around as requested by many WT users - simply use "Export > File" from the File menu. I believe the Shortcut Key for this is [Ctrl][F12]
If none of the above is appropriate or desirable, I would suggest doing a Windows Search and use something like "*.ax*" as the filter. Sorting the resulting list by date should let you home in on the file you want/need. If you determine that there is an AXB file out there, I would first make a copy - name it something like Sketch-B.ax2 just so you will have something out there to fall back on if necessary.
BTW, unless you are still using Apex v2.x (unlikely), the file isn't likely really a version 2 file. The WT integration just doesn't use a current file extension. But even so, if the file is a valid Apex file, it will skip past the extension and open it anyway, so it is not a problem. I just wanted to make sure you knew that just because WT use of our integration tools names it like a version 2 file, it really is not, so it cannot be opened by Apex v2. If you ever want to see what version made the file you are working on, select "Sketch info" from the File menu.
Hope this helps!
-Randall Garrett-
..Apex Software..