There are "almost no" problems. What have you tried and where did you encounter problems?

There is a problem with non-ascii filenames - Perl treats all filenames as opaque strings when it passes them to open. Depending on your combination of filesystem and operating system, you might get lucky and find that they also treat the filenames as opaque strings. Then you can just create files with any name you like and will find little problems out of the ordinary, when reading filenames from readdir or glob or text files.

For example on Windows+NTFS, the situation is different. Windows with NTFS encodes non-ascii filenames as UTF-16LE, but Perl does not use the proper APIs (yet) to access such files by their given name. This means that you will encounter interesting problems there where readdir returns filenames that do not match up with the names you find in text files or with a hardcoded filename you give in the source code.

Also see (found via site:perlmonks.org filename encoding)

In reply to Re: how to make a filename in unicode characters by Corion
in thread how to make a filename in unicode characters by srikrishnan

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