Programmer's Workbench
Appearance
Microsoft Programmer's Workbench (PWB) is an integrated development environment for DOS and OS/2 that shipped with different language products.
Features

- Extensions
- PWBROWSE - Source browser
- PWBHELP - Online help system
- PWBMASM - MASM
- PWBUTILS - NMAKE, LINK and CodeView options commands
- Files
- .BAK - Backup copies of changed files
- .BSC - Source browser
- .MAK - Control file for NMAKE
- .MRK - Markings
- .OUT - Profiler output
- .PBI, PBO, PBT - Profiler intermediate files
- .SBR - Status