Welcome to the PC Pitstop File Extension Library, the internet's most complete and comprehensive source for file extension information. Over the years PC Pitstop has developed numerous free scans that diagnose various PC performance issues. Over 200 million scans that have been run all over the world contribute to our file extension libraries.

Open files with Preloader for 1-2-3 for Windows - 123w.exe

Preloader for 1-2-3 for Windows
123w.exe
Lotus Development Corporation
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Search For File Extensions

File Extension


Supported Extensions


Name Extension
1-2-3 Worksheet .wk3
1-2-3 Worksheet .wk4
1-2-3 Worksheet .wk1
1-2-3 SmartMaster .wt4
Lotus 1-2-3 9 Smart Master .12m
OpenDocument Spreadsheet .123
1-2-3 Worksheet .wr1
1-2-3 Worksheet .wrk
Microsoft Works Spreadsheet .wks
1-2-3 ワークシート .wj3
1-2-3 ワークシート .wj2
Microsoft Office Excel 97-2003 Worksheet .xls
Microsoft Office Excel Comma Separated Values File .csv
backup File .bak
Microsoft Works Spreadsheet .bks
Name Extension
Microsoft Works Spreadsheet .xlr
QuickBooks Import/Export File .iif
Text Document .txt
Setup Information .inf
1-2-3 ワークシート .wj1
HP Printer Control Language .prn
Text Document .log
Microsoft Office Excel Worksheet .xlsx
dat .dat
Sit StuffIt Archive .sit
Paradox Table .db
LinkSurvey Document .lss
Pages3D Document .qsd
Dialogic VOX file .sol
AR Pro 7 Saved Formula .12a

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Tips from the PitCrew

Tips from the Pit Crew

If a hardware device isn't functioning properly, or if a program or game that you're installing states that it requires newer drivers, a driver update will be in order.

Also, with many wireless adapters it is important to stay current as updates often contain security fixes. A driver update may also improve stability and performance, or may fix issues with games, programs and power management.

New drivers can unlock additional features for a device that may not have been available before. If you receive notification from a program or a manufacturer that a newer driver is available, it would be a good idea to check the release notes and see what’s different than the driver you’re already using.

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