How to open .nlm files? (UMLS data) - zip

I am working with UMLS data (Unified Medical Language System) and they have zip files which contain files with .nlm extention and .md5 file (probably .md5 files for storing the keys to open .nlm files but I am not sure), and I don't know how to open them. In the notepad it shows symbols which are not readable. Can I convert .nlm files to text format or any other readable format or there are any software or libraries to see their encoded data?
I want to see the tables or data like this after I open .nlm file:
3|ENG||||||8717795||58488005||SNOMEDCT_US|PT|58488005|1,4-alpha-Glucan branching enzyme||N||
3|ENG||||||8717796||58488005||SNOMEDCT_US|FN|58488005|1,4-alpha-Glucan branching enzyme (substance)||N||
3|ENG||||||8717808||58488005||SNOMEDCT_US|SY|58488005|Amylo-(1,4,6)-transglycosylase||N||
3|ENG||||||8718164||58488005||SNOMEDCT_US|SY|58488005|Branching enzyme||N||
19|ENG||||||10794494||112116001||SNOMEDCT_US|SY|112116001|17-hydrocorticosteroid||N||
19|ENG||||||10794495||112116001||SNOMEDCT_US|SY|112116001|17-hydroxycorticoid||N||
19|ENG||||||10794496||112116001||SNOMEDCT_US|PT|112116001|17-hydroxycorticosteroid||N||
19|ENG||||||10794497||112116001||SNOMEDCT_US|FN|112116001|17-hydroxycorticosteroid (substance)||N||

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