Walter the manual: Posix on MPE/ix
http://docs.hp.com/en/32650-90854/ch08s01.html

Has the following on names: 
HFS syntax operates as follows:

HFS file or directory names can include alphanumeric characters (A-Z, a-z, 0-
9) and the special characters dot (.), underscore (_), and hyphen (-). 

File or directory names cannot begin with a hyphen (-). 

HFS syntax is case sensitive. So, HFS file or directory names can be in 
uppercase, lowercase, or mixed case. 

HFS file or directory names are specified in the CI and in intrinsics by 
preceding them with a . or /. 

HFS file or directory names can be specified in the shell without having to 
precede the names with a . or /. 

HFS directory or file names that are directly under the root or directly under a 
group or account must be less than or equal to 16 characters. 

HFS directory or file names under HFS directories can be up to 255 characters 
long.


Hope this helps: 
Best Regards

 Cathlene Mc Rae
HP SR. Response Center Engineer
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