Anybody knows what "Senate rules X file" means?

SB 5615 - 2009-10 (What is this?)

Reclassifying possession of forty grams or less of marijuana from a misdemeanor to a class 2 civil infraction.
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History of Bill
as of Tuesday, April 7, 2009 12:25 PM

Sponsors: Senators Kohl-Welles, Kline, McDermott, Murray
Companion Bill: HB 1177

2009 REGULAR SESSION
Jan 27 First reading, referred to Judiciary. (View Original Bill)
Feb 10 Public hearing in the Senate Committee on Judiciary at 10:00 AM.
Feb 18 Executive action taken in the Senate Committee on Judiciary at 3:30 PM.
Feb 19 JUD - Majority; do pass.
Minority; do not pass.
Passed to Rules Committee for second reading.
Mar 25 Senate Rules "X" file.