MODE32 users should be absolutely certain to install the new MODE32 version 7.5 from Connectix (see TidBITS-243) before upgrading to System 7.5. We have it on good authority that installing System 7.5 on a non-32-bit-clean Macintosh with an earlier copy of MODE32 (or perhaps Apple's 32-bit Enabler) may cause severe damage to the system software, necessitating a complete reinstallation. Also, MODE32 7.5 is compatible with System 7.1, should you not have upgraded to 7.5 yet. [MHA]
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Show Hidden Files in Open/Save Dialogs in Snow Leopard
In Snow Leopard, if you want to show otherwise hidden files in Open and Save dialog file lists, just press Command-Shift-period. Pressing it again hides the files.