If I open assembly from Window File Explorer, SW won't ask for missing files.
Thanks everyone for the input. I need to clarify a bit. Solidworks used to prompt me to either map the missing file, or suppress missing files. Now it just opens the open dialog box. I didn't necessarily mind the prompt because it gave me the option to suppress all missing files.
Sounds like “Browse” was selected at some point when opening an assembly or drawing and “Don’t Show me this again” was also checked.
Following what ömür tokman stated;
1) Navigate to : Tools > Options > System Options > Messages/Errors/Warnings
2) Try clicking the “Reset..” button and choosing “Reset this page only”
3) Now close\restart SolidWorks and next time you open an assembly which is missing components you should be prompted for which action you would like to take.