We use the following archiving formats. Search the converters subdirectory for appropriate utilities to extract the content from some of these.
| Pattern | Format | Contents | Tools | 
|---|---|---|---|
n!file | 
 ZipCoded 1541 disk image (n=1–4) | RLE compressed normal 1541 disk tracks | cbmconvert and others | 
n!!file | 
 ZipCode Sixpack of nonstandard 1541 disk image (n=1–6) | RLE compressed raw GCR 1541 disk tracks | cbmconvert and others | 
file.arc | 
 Archive (C64) | A compressed collection of Commodore files | cbmconvert | 
file.ark | 
 Arkive archive (C64) | An uncompressed collection of Commodore files | cbmconvert | 
file.bin | 
 Raw binary file | The contents of an EPROM or ROM chip | |
file.cas | 
 Tape image of a single file (192-byte tape header followed by raw data) | Commodore tape program file | cbmconvert, c2n, MESS | 
file.csm | 
 Tape image of a multiple file (192-byte tape header blocks and variable-length program blocks following each other) | Commodore tape program file | cbmconvert, c2n, MESS | 
file.cvt | 
 Sequential conversion of a GEOS file | GEOS application or document | cbmconvert and Convert on GEOS | 
file.d64 | 
 1541 disk image (683 blocks of 256 bytes each) | A collection of Commodore files | cbmconvert, many emulators and data transfer programs | 
file.gif | 
 Bitmapped image | Usually a technical drawing | an image viewer program with GIF support | 
file.gz | 
 gzip compressed file | Usually combined with an uncompressed archiving format, such as
 .d64, .lnx or .tar. | 
 gzip,
 WinRAR; Microsoft
 Internet Explorer may decompress these files while downloading without
 removing the .gz suffix.  WinZip refuses to work with such files;
 you will have to remove the .gz suffix manually. | 
file.html | 
 Hypertext mark-up language (World Wide Web Consortium) | A hypertext document | Mozilla or other HTML browser | 
file.jpg | 
 Bitmapped continuous-tone image (Joint Photographic Experts Group) | A technical drawing or a photograph | an image viewer program with JPEG image file support | 
file.lnx | 
 Lynx archive (C64, C128) | An uncompressed collection of Commodore files | Supported by cbmconvert | 
file.lha | 
 Lempel–Ziv–Huffman archive | A compressed collection of files. | lha, WinRAR | 
file.lzh | 
 Lempel–Ziv–Huffman archive; an old version of
 .lha | 
 A compressed collection of files. | Uncompress with lhx64 on the Commodore 64; on the Commodore 128, with CS-DOS or PMARC on CP/M. | 
file.png | 
 Bitmapped image (Portable Network Graphics) | Usually a technical drawing | an image viewer program with PNG support | 
file.prg | 
 2-byte address followed by raw data | Commodore program file | |
file.pdf | 
 Adobe Portable Document Format | A page-oriented alternative to .html | 
 xpdf, Adobe Acrobat Reader | 
file.seq | 
 Raw sequential data | Commodore sequential data file | |
file.sda | 
 Self Dissolving .arc archive with a .prg
 header | 
 A compressed collection of files | To extract the contained files, load and run the archive on a Commodore 64. | 
file.sfx | 
 Self eXtracting .lzh archive with a .prg
 header | 
 A compressed collection of files | To extract the contained files, load and run the archive on a
 Commodore 64 or a Commodore 128.  Alternatively, remove the first 3721 bytes
 to obtain a .lzh file. | 
file.tar | 
 Unix tape archive
 (tar) | 
 An uncompressed collection of Unix files | tar on Unix systems,
 WinRAR | 
file.txt | 
 Plain ISO 8859-1 text | A plain text document | a text file editor or viewer | 
file.zip | 
 A zip archive | A compressed collection of files | Info-Zip, WinRAR |