You don't need to edit your text files in other program's than HyperCard any more. You should use TextScalpel whenever you want to split a text file into smaller chunks. You decide when to create another file based on the file length, based on paragraphs or a character or string that you specify. Also lets you split a text file into equal length files, e.g. to avoid the 32K Text-Edit limitation in some programs. Also works with folders.
Extensive documentation is available using the online help.
This XFCN is used in some of my newer programs. Every night Auto-BBSAdmini compares the list of autoregistered users to a list of paying members of the macclub benelux. If a user entered the correct userID, his privileges are upgraded to reflect his status, otherwise his privileges are set to expired user. The administrator of the BBS only has to list the users with those privileges once in a while and to delete their accounts. This program was used to create disks with messages from the BBSes of Mactivity - macclub benelux for members who don't have a modem.