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I think the file format extension is .tiff. .tif comes from a MS Dos limitation (max 8.3). On Mac at least there are many extensions longer than 3 characters, including .afphoto and .afdesign.

Affinity Photo - Affinity Designer - Affinity Publisher | macOS Sonoma (14.2) on 16GB MBP14 2021 with 2.4 versions

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8 minutes ago, RNKLN said:

I think the file format extension is .tiff. .tif comes from a MS Dos limitation (max 8.3). On Mac at least there are many extensions longer than 3 characters, including .afphoto and .afdesign.

 

So long as Affinity's extensions are the same as other photo software's output I don't care how long they are. It is the consistency that we are after.

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3 minutes ago, Sima said:

I have no idea why Serif don't standardise on *.tif.  There's no advantage by defaulting to *.tiff when everyone else uses *.tif and have done for a long time.

Maybe blame this on Apple, or just accept it as a consequence of the history of the development & codification of file types:

 

Back when the DOS "dot & three" extension convention was the standard, Apple rejected this as too limiting. Instead the "classic" Mac OS (system 7, 8, etc.) relied on four byte creator & file type codes, stored in the file's resource fork

 

The Macintosh file type code for tagged image format files is "TIFF" -- you can find it mentioned in RFC's like RFC3302 -- & the four character notation is also used in the Internet Media (MIME) type & UTI specifications ("image/tiff" & "public.tiff" respectively. It also appears in the name of official release specification owned by Adobe (as "TIFF 6.0").

 

So there is to some small extent an advantage (or at least a consistency) in using the *.tiff extension, even if it has not historically been in use for the longest time.

 

That does not make it any less a PITA, though.

All 3 1.10.8, & all 3 V2.4.1 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7
Affinity Photo 
1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7

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