How to perform P4 opened for file

[AlexB]

I want to perform "p4 opened <some file>" in the P4 action for any changelist, but VBP performs "p4 opened -c default <some file>" instead. The file is opened not in the default change list and I don't know the changelist number.

How can I perform P4 action without specifying changelist?

P.S.
I think VBP must not specify any changelist if I didn't specify it in the "Change List #: field". If I want to specify "default" changelist, I'll fill the Change list # filed with "default". This is actually for other actions too (submit, reopen etc).