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The character å (0xE5) was not allowed as the first letter in a filename under 86-DOS and MS-DOS/PC DOS 1.x-2.x, but can be used in later versions. In Windows utilities, the space and the period are not allowed as the final character of a filename. [19]
If the filename contains characters not allowed in an 8.3 name (including space which was disallowed by convention though not by the APIs) or either part is too long, the name is stripped of invalid characters such as spaces and extra periods. If the name begins with periods . the leading periods are removed.
Characters such as the hash (#) or question mark (?) which are part of the filename should be percent-encoded. Characters which are not allowed in URIs, but which are allowed in filenames, must also be percent-encoded. For example, any of "{}`^ " and all control characters. In the example above, the space in the filename is encoded as %20.
6.3 filename (binary files), 9 characters (ASCII files) [12] [13] Max directory depth: No sub-directories: Allowed filename characters: ASCII (0x00 and 0xFF not allowed in first character) [12] [13] Features; Dates recorded: No: Attributes: Write protected, EBCDIC conversion, read after write, binary (random rather than sequential file) [12] [13]
The Multics file system stores the file name as a single string, not split into base name and extension components, allowing the "." to be just another character allowed in file names. It allows for variable-length filenames, permitting more than one dot, and hence multiple suffixes, as well as no dot, and hence no suffix.
Some filenames are given extensions longer than three characters. While MS-DOS and NT always treat the suffix after the last period in a file's name as its extension, in UNIX-like systems, the final period does not necessarily mean that the text after the last period is the file's extension. [1]
In computer science, an illegal character is a character that is not allowed by a certain programming language, protocol, or program. [1] To avoid illegal characters, some languages may use an escape character which is a backslash followed by another character.
The following additional characters are also not allowed for short filenames: + , . ; = [ ] (but they are allowed for LFNs with VFAT). 0xE5 was not a valid character for the first letter in a filename under 86-DOS, and MS-DOS/PC DOS 1.x-2.x, but is in higher versions. This was done to suppport alternative codepages since DOS 3.0.