File separators of Path name of ZipEntry?

The .zip file specification states:

4.4.17.1 The name of the file, with optional relative path. The path stored MUST not contain a drive or device letter, or a leading slash. All slashes MUST be forward slashes '/' as opposed to backwards slashes '\' for compatibility with Amiga and UNIX file systems etc. If input came from standard input, there is no file name field.

The file separator is dependent on the application that creates the zip file. Some applications use the system file separator, whereas some use the "civilized" forward slash "/". So, if you are creating the zip file and then consuming it, then you can simply use a forward slash as file separator. If the zip file is created on somewhere else, then you should find out which separator was used. I don't know a simple way, but you can use a brute method and check out both separator types as you progress.

Some applications, especially custom zip creation codes, can mix the separators on different zip entries, so don't forget to check out each entry.