Assuming you have found a file named PW2_Dogfight_v1.2_NoCD.7z from a trusted source (e.g., a private retro gaming forum like Redump or CS.RIN.RU).
If the game crashes on launch, the crack may be incompatible with your OS. Try running in a Windows XP virtual machine. no cd crack for pacific warriors ii dogfight upd
The no-CD crack for Pacific Warriors II: Dogfight, like many others, was typically created by reverse-engineering the game's code to bypass the CD-ROM check. These cracks could be found on various file-sharing platforms and gaming forums. They often came in the form of executable files that would replace the original game executable or as patches that would modify the game's code. Assuming you have found a file named PW2_Dogfight_v1
The use of no-CD cracks had several implications: If the game crashes on launch, the crack
Good Old Games (GOG) specializes in removing DRM from old games. Pacific Warriors II is not currently on GOG, but flooding their community wishlist with requests for "Dogfight UPD" has worked for other niche titles.
For the technically inclined, creating your own no-CD crack for the Dogfight UPD is a viable (but labor-intensive) option:
Most modern crackers, however, simply recommend running the game inside a Windows XP virtual machine (Oracle VirtualBox or VMware) with the CD mounted as an ISO.