Appendix - File Extensions
Author: Copyright (C) 2014 by CiderPress authors

File Extensions

CiderPress handles a variety of Apple II file and disk image formats. If you associate these files with CiderPress, opening the documents (perhaps by double-clicking on them from Windows Explorer) will launch CiderPress automatically.

Some files can be interpreted in more than one way. For example, ".BXY" files are ShrinkIt archives wrapped in a Binary II header. The file selector you choose in the "Open File" dialog determines how the file is opened. When double-clicking on a file, however, you don't have an opportunity to make a choice, so CiderPress tries to guess which way you wanted. The same applies when opening a file with the selector set to "All Files (*.*)".

The following table summarizes the types handled and the method of handling them.

Ext Description Default Action

.2MG 2IMG disk image Open as disk image

.APP Disk image in TrackStar nibble format Open as disk image

.BNY Binary II Open as Binary II

.BQY Compressed Binary II Open as Binary II

.BSE GSHK Self-Extracting Archive, wrapped in Binary II Open as NuFX

.BXY NuFX wrapped in Binary II Open as NuFX

.DDD DDD-compressed disk Open as disk image

.DO DOS-order disk image Open as disk image

.DC6 DiskCopy 6.x image Open as disk image

.DSK Disk image (often DiskCopy 4.2) Open as disk image

.GZ Disk image compressed with gzip Open as disk image

.HDV Raw disk image Open as disk image

.IMG Disk image (usually Copy ][+) Open as disk image

.PO ProDOS-order disk image Open as disk image

.RAW Raw disk image Open as disk image

.SDK NuFX disk archive Open as disk image

.SEA GSHK Self-Extracting Archive Open as NuFX

.SHK NuFX file or disk archive Open as NuFX

.ZIP Disk image compressed with ZIP Open as disk image

(none) File with no extension Open as disk image

If the default handler fails, the file will not be opened.

DiskCopy 6 can create images in a "raw" format or with fancy headers. CiderPress only handles the "raw" form.

CiderPress does not create file associations for .RAW because there are many other PC file formats that use the same extension. A similar exclusion is made for .GZ and .ZIP, because the extension only indicates that "gzip" or "zip" was used to compress the file. It doesn't say anything about the contents.