- Windows deletes any invalid characters and spaces from the file name. Invalid characters include:
. " / \ [ ] : ; = ,
- Because short file names can contain only one period (.), Windows removes additional periods from the file name if valid, non-space characters follow the final period in the file name. For example, Windows generates the short file name
Thisis~1.txtfrom the long file name
This is a really long filename.123.456.789.txtOtherwise, Windows ignores the final period and uses the next to the last period. For example, Windows generates the short file name
Thisis~1.789from the long file name
This is a really long filename.123.456.789.
- Windows truncates the file name, if necessary, to six characters and appends a tilde (~) and a digit. For example, each unique file name created ends with "~1." Duplicate file names end with "~2," "~3," and so on.
- Windows truncates the file name extension to three characters or less.
- Windows translates all characters in the file name and extension to uppercase.
For example, "Afile~1.doc" is generated from "A file.doc" because the long file name contains a space.
No short file name is generated from "A_file.doc" because the file name contains less than eight characters and does not contain a space.
The short file name "Alongf~1.txt" is generated from the long file name "A long filename.txt" because the long file name contains more than eight characters.