What is the 01B file format?
A file with the .01B extension is a file known as PenSoft Payroll Backup Format. This format is associated with Paychex, Inc..
The reliable way to open a .01B file is with software that recognises this exact format, rather than guessing from the file name. If you are not sure what created a file, our file identifier can read its first bytes and name the real format, even when the file has been renamed.
We are still gathering the list of programs that open .01B files. A fully verified, hand-written description of this format is being prepared; until then, the details on this page are drawn directly from our database.
Format details
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