Some File Types Wont play need help

[smellyfartsrule]

I have some files that wont play on my comp. they .001 extension or whatever, I tried the file extension changer and it doesn't work still, does anyone have any suggestions for me

[smellyfartsrule]

What joiner and splitter should I use, I figure that's what I have to do

[smellyfartsrule]

nevermind, forget this post, I figured it out

[Guzara]

HJ Split.