This.hostContainer problem

I don't understand why if(this.external && this.hostContainer) returns true when my PDF is embedded in an HTML document, but if I change the file to an HTA (trusted) document, this.external is still true, but this.hostContainer returns undefined. Since an HTA is just a trusted web page running on IE, why doesn't the hostContainer property work? Is there a workaround?
Thanks,
Scott

No, it does work inside an HTML document as the undefined evaluates to false. If I change the HTML page into an HTA page, this.hostContainer has no properties and is undefined when it should not be.

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I've also posted about this problem in the Acrobat Scripting
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Introduction
This project revolves around an important text processing task, text compression. In particular, you will be required to encode a sequence of words read from a source file into binary strings (using only the characters 0 and 1). It is important to note that text compression makes it possible to minimize the time needed to transmit text over a low-bandwidth channel, such as infrared connection. Moreover, text compression is helpful in storing large documents more efficiently. The coding scheme explored in this project is the Huffman Coding Scheme. While standard encoding schemes, such as Unicode and ASCII, use fixed-length binary strings to encode characters, Huffman coding assigns variable-length codes to characters. The length of a Huffman code depends on the relative frequency of its associated character. Specifically, Huffman coding capitalizes on the fact that some characters are used more frequently than others to use short codewords when encoding high-frequency characters and long codewords to encode low-frequency characters. Huffman coding saves space over state of the art fixed-length encoding and is therefore at the heart of file compression techniques in common use today. Figure 1 shows the relative frequencies of the letters of the alphabet as they appear in a representative sample of English documents.
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B     17     O     67
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G     17     T     85
H     50     U     37
I     76     V     12
J     4     W     22
K     7     X     4
L     42     Y     22
M     24     Z     2
Figure 1. Relative frequencies for the 26 letters of the alphabet.
Huffman coding and decoding
Huffman’s algorithm for producing optimal variable-length codes is based on the construction of a binary tree T that represents the code. In other words, the Huffman code for each character is derived from a full binary tree known as the Huffman coding tree, or simply the Huffman tree. Each edge in the Huffman tree represents a bit in a codeword, with each edge connecting a node with its left child representing a “0” and each edge connecting a node with its right child representing a “1”. Each external node in the tree is associated with a specific character, and the Huffman code for a character is defined by the sequence of bits in the path from the root to the leaf corresponding to that character. Given codes for the characters, it is a simple matter to use these codes to encode a text message. You will have simply to replace each letter in the string with its binary code (a lookup table can be used for this purpose).
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Figure 3. Huffman tree for String X.
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Since updating to 10.4 I've been getting this error message on computer startup
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