Does this mean it's not getting added in the future since I'm the only soul who is still using it or are you guys busy with much more important stuff and It will eventually come?
The aim of the preview build was to not screw around with existing settings especially when it was starting out as a plug-in pack for 5.666. As such I don't have any code in the builds that can register what file types WACUP can handle but there are things in place to allow for manually associating it if that's wanted (e.g. the open with option the OS provides & then the options on preferences -> general can be changed to adjust what the default behaviour in response to command-line actions is using). At some point I'll get around to completing the feature along with having to look into implementing a shell extension to resolve other problems with trying to process many files which the basic command-line behaviour doesn't cope well with in recent Windows versions.
I only play mp3 files, no idea if it happens with other formats.I'm using the latest build (1.99.27.21136 (x86))
Are you also looking at the metadata &/or making changes to the metadata of those MP3 files?
Very interesting. And thanks for the insight! To answer your question: No metadata changes on my behalf, just simple playback.
Also I have further feedback which may be of use to you:
Today I noticed a different hooking behaviour: I listened to File 1 in folder 1. Then I doubleclicked and listened to File 2 from Folder 2. After the track ended and playback stopped, I deleted Folder 1 and was suprised that it couldn't be deleted. File 2 from Folder 2 was still in the playlist and WACUP was open, and to my surprise windows allowed me to delete Folder 2, but in order to delete Folder 1 I had to close WACUP. To summarize, it's as if the second to last file got hooked. Weird erratic behaviour. File 1 was 58 minutes and File 2 was 7 or so minutes, and I waited the whole 7 minutes and once it stopped I attempted to delete File 1 with WACUP still open.