VPK doesn't extract

[MOCOLONI]

Last month I found out that no longer can I just drop a VPK archive into vpk.exe (or a shortcut) to extract the contents said archive; all it does is generate the folders found within the archive, but not the actual files in them. It will still, however, successfully generate an archive.

Counter-Strike: Source's VPK.exe by that time still worked up until an update it received last week from 2 months ago, and it also doesn't work anymore. I checked for parameters but nothing new in terms of extraction. Right now I have to make use of GCFScape to extract content. Does anyone know something about this?

 

[DrSquishy]

This is fascinating. Testing with source SDK base 2013 (multiplayer) and tf2's, they have both been updated in the past few months; both fail in extracting; and both fail with an error when doing a single file extraction (x <vpk> <file> they both error out with 'unable to create <file>'). Permissions seemed to be fine for both, and I tried running them as administrator yet nothing changed. VPK version doesn't seem to make a difference either (tried changing the header of a v2 VPK to v1 to no success).
Finally, I tried with Fist Full of Frags, and it seems to extract just fine. This one hasn't been updated in a while, so I'm curious as to what may have changed to break this functionality.