Files found online with generic names like "new folder" or those ending in .rar can sometimes be used to distribute malware. Always perform the following before opening:
rar l "Code postal new folder 12.rar" to list the contents without extracting. Code postal new folder 12.rar
Right-click → “Extract to Code postal new folder 12/” (or use 7-Zip → “Extract Here”). Files found online with generic names like "new