File extension: .WKQ (BORQU), .WQ1 (BORPQU), .wkq (file name extension, BORQU), .wq1 (file name extension, BORPQU), CAL (SuperCalc), COL (MS Multiplan), FM1 (Lotus 1-2-3 release 2.x), FM3 (Lotus 1-2-3 release 3.x), IMP (Lotus Improv), JZZ (Jazz), LCW (Lucid 3-D), LSS (Legato - IBM Works for OS/2), MDL (CA-Compete!), PXL (Microsoft Pocket Excel), SPR, WK1 (Lotus 123 version 2.x - Symphony 1.1+), WK3 (Lotus 123 version 3.x)
Универсальный русско-английский словарь. Академик.ру. 2011.