Description:
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I had some weird problems for months now trying to solve the No input file specified error.
And all I found on the web couldn't help me.
As I used to recall similair strange errors with a IIS6/W2K3/PHP5/MySQL5.x, I got back to the basics.
And as always, it is the compatibility between extensions from PHP versus MySQL.

One which now succesfully works for my multi hosted environment: PHP 5.2.9-1 & MySQL 5.0.77

Any other combination of higher versions of MySQL will definately give you trouble.

As for what I tried in any order:
- Switched of EXIF extension as it has caused trouble
- Never used the doc_root = , so was already empty/disabled also
- Had minor succes moving PHP from C:\Program Files\PHP to C:\PHP
- Tried numerous other PHP5 versions versus MySQL 5.1
- Multi host environment weirdo: Site 1 works, Site 2 doesn't especially with pages using MySQL

So finally, installed over and over until to one which succesfully works: PHP 5.2.9-1 & MySQL 5.0.77

Maybe the mysql extension needs a lookup against MySQL 5.1 in a multi host environment.

Reproduce code:
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One way of getting a No input file specified error, is to do the following:
Install PHP and MySQL 5.1 on IIS6/W2K3
Make a custom errorpage for 404 errors which in fact is a php-script (e.g. redirect.php)
Now try visiting your domain for index.php, OK
Now try visiting your domain for a non exsisting php-script and bingo!
No input file specified.


Expected result:
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The redirect.php in action

Actual result:
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No input file specified.