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Is it possible to upload file types like ".psd", ".eps", ".zip", ".txt", and so on..?

And, can anyone recommend a PHP based upload handler script which also allows uploads of all kind of files?

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An <input type='file' /> element on submit will allow uploading of all file types that I am aware of. The data will exist in your $_FILES super global array in PHP.

You likely will have some restrictions in your php.ini file, especially regarding file size.

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Can I change those file size restrictions?
Yeah. You can change the MEMORY_LIMIT value in php.ini for a permanent change. You can temporarily override the php.ini MEMORY_LIMIT by executing PHP's ini_set( 'MEMORY_LIMIT' ); function. See: php.net/manual/en/function.ini-set.php
@wescrow the upload_max_filesize may need changing too, the default is 2M this can only be changed in php.ini or using .htaccess
@RMcLeod You are absolutely correct. That is actually what I meant to reference. Although, both may need upped depending on their current settings.
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Its possible to upload anything if you're using the standard file control <input type='file'>, its completely indiscriminate.

Obviously it's then down to what you have on your server as to what you can do with the file that's been uploaded,

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Be careful with the file upload - you should restrict as much as you can, a minimalist approach, bad things can happen, like malicious intent. Spend time here, http://php.net/manual/en/features.file-upload.php, great scripts and commentary on how to handle/best practices.

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