Creator code

A creator code is a mechanism introduced in the classic Mac OS to link a data file to the application program which created it. The similar type code held the file type, like "TEXT". Together, the type and creator indicated what application should be used to open a file, similar to (but richer than) the file extensions in other operating systems. To avoid conflicts, Apple maintained a database of creator codes in use. Developers could fill out an online form to register their codes. Apple reserves codes containing all lower-case ASCII characters for its own use.

Creator code

A creator code is a mechanism introduced in the classic Mac OS to link a data file to the application program which created it. The similar type code held the file type, like "TEXT". Together, the type and creator indicated what application should be used to open a file, similar to (but richer than) the file extensions in other operating systems. To avoid conflicts, Apple maintained a database of creator codes in use. Developers could fill out an online form to register their codes. Apple reserves codes containing all lower-case ASCII characters for its own use.